The thing that I see excusing the misogyny that you see is also the reason that I hate this. A sitcom-level resolution seems appropriate when you've had Peter and Michelle acting as though they're characters in a sitcom or a bad romantic comedy. We've had the improbable meeting, the "comic" first date disaster-first date here being a euphemism for drunk sex, of course-, we've had the conflict that could have been resolved in ten seconds by either of them not acting like idiots, so why not have a stock ending like that. It would even make sense if there'd been a history of sexual/romantic tension between them, but I've come to accept that the Spider-Man story in my head is better than the one Marvel publishes.
But I really hate mistaken identity plots in sitcoms and this seems very much like a setup to one. Fake Peter thinks a picture of Gwen is MJ, won't it be funny when he meets MJ and says something to that effect? Real Peter wants to get back together with MJ, but fake Peter is starting an ongoing sexual relationship with Michelle, can't you just picture the wacky hijinks that'll happen when real Peter has any contact with either of them?