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I don't think Severus wanted anything to do with the Marauders after James and Sirius ridiculed him on the train, and then went on to be sorted into Gryffindor, a House which Severus held in contempt for its anti-intellectual attitudes. He watched them out of self-defense, to see what they might try on him and others next. And Remus wasn't an outcast - he had the Marauders for friends since first year.
We don't know the Slytherins of his generation other than Lucius, the Blacks and the Lestranges were rich - I would guess most weren't, simply because there can be only that many at the top in any society (and even among them some were in other houses - see James). Also, Lucius' welcoming attitude at the Sorting would have signaled to his followers in the House (and Lucius was likely a more influential leader in his House than Percy in Gryffindor) that all Slytherins are part of the same in-group (and Lucius at 17 must have known there were no Snapes in Nature's Nobility). This may have changed a bit later after Lucius left Hogwarts, but perhaps it did not - we know that as late as 5th year Severus was hanging out with Avery and Mulciber. That they did not defend him during SWM could be either because they were in a different year and weren't around (I see Severus as one who would seek older friends, so probably 6th years), or as someone (Hwyla?) suggested elsewhere - because Severus was distancing himself from them after his argument with Lily following the Shrieking Shack incident.
As for how Remus treated Severus - by the time of SWM Severus clearly recognized Remus' attitude as passive support of James and Sirius. But we have a reason to think Remus' support of the Marauders went beyond that - his text is the first to insult Severus from the Map.
I agree with Hwyla that in POA Severus was totally distrustful of Remus (completely justifiably though not exactly for the correct reason, as it turned out) and Remus was disrespectful of Severus. At the beginning of HBP Severus warns Tonks (a former student of his, BTW) that Remus is a weak person whom she shouldn't trust with her heart (another good observation). Remus only develops some begrudged respect for Severus after his own experience as spy/delegate among the werewolves (and after he finds himself alone again following Sirius' death). Severus takes a huge risk when he tries to defend Remus in the 7-P battle. My guess is he would have done so for (almost?) any Order member, but at least it means Severus recognizes Remus' worth as such.
If it weren't for the Astronomy Tower, I think Remus would have sought Severus out as a substitute for the Marauders. Severus may have reciprocated, but only after a while, or after he saw Remus proving himself to be not as weak as Severus believed him to be. I can believe Snupin scenarios in post-war fics if they have a slow enough start or in AUs where Remus takes a clear stance against the other Marauders, or where Severus and Remus are in the same House or there aren't Houses.
We don't know the Slytherins of his generation other than Lucius, the Blacks and the Lestranges were rich - I would guess most weren't, simply because there can be only that many at the top in any society (and even among them some were in other houses - see James). Also, Lucius' welcoming attitude at the Sorting would have signaled to his followers in the House (and Lucius was likely a more influential leader in his House than Percy in Gryffindor) that all Slytherins are part of the same in-group (and Lucius at 17 must have known there were no Snapes in Nature's Nobility). This may have changed a bit later after Lucius left Hogwarts, but perhaps it did not - we know that as late as 5th year Severus was hanging out with Avery and Mulciber. That they did not defend him during SWM could be either because they were in a different year and weren't around (I see Severus as one who would seek older friends, so probably 6th years), or as someone (Hwyla?) suggested elsewhere - because Severus was distancing himself from them after his argument with Lily following the Shrieking Shack incident.
As for how Remus treated Severus - by the time of SWM Severus clearly recognized Remus' attitude as passive support of James and Sirius. But we have a reason to think Remus' support of the Marauders went beyond that - his text is the first to insult Severus from the Map.
I agree with Hwyla that in POA Severus was totally distrustful of Remus (completely justifiably though not exactly for the correct reason, as it turned out) and Remus was disrespectful of Severus. At the beginning of HBP Severus warns Tonks (a former student of his, BTW) that Remus is a weak person whom she shouldn't trust with her heart (another good observation). Remus only develops some begrudged respect for Severus after his own experience as spy/delegate among the werewolves (and after he finds himself alone again following Sirius' death). Severus takes a huge risk when he tries to defend Remus in the 7-P battle. My guess is he would have done so for (almost?) any Order member, but at least it means Severus recognizes Remus' worth as such.
If it weren't for the Astronomy Tower, I think Remus would have sought Severus out as a substitute for the Marauders. Severus may have reciprocated, but only after a while, or after he saw Remus proving himself to be not as weak as Severus believed him to be. I can believe Snupin scenarios in post-war fics if they have a slow enough start or in AUs where Remus takes a clear stance against the other Marauders, or where Severus and Remus are in the same House or there aren't Houses.