Remus, again, had no idea what he could say that wouldn't upset someone he cared about. In fact, being no more schooled in the proper etiquettes than Victoire, presumably -- or at least, the Society etiquettes a member of his chosen family should know -- he should likely keep his mouth shut and let Regulus or Astoria handle things.
But, as at the wedding, there was one button Victoire had to push that ensured his temper would flare, even if his words remained calmer than gaze -- insult Regulus.
"Or, perhaps," he said evenly, wishing silently his son would not continue to allow Victoire to speak for him long, or she would cut him off from his family completely. "We can all agree your presence is, if not ill-mannered, at the least baffling given the sentiments you have previously expressed in regard to your opinons of this family. I had, in fact, understood you to have no desire to allow your husband contact with his family, which makes your acceptance of an invitation to dine with that family all the more curious and the reaction you have received understandably justified."
Remus didn't have Regulus or Belvina's flare with words. As Stephen had rightly surmised some months earlier, he didn't do politics well at all. But, he didn't do sitting quietly and letting the man he loved or those he had chosen as his family be insulted to their faces well, either. He didn't have to hang onto Regulus' arm protectively, or try to shield him from Victoire. His lover was quiet capable of handling her on his own, and likely with more finesse than Remus. Still, it was Remus' nature to protect, even if he was rightfully lectured on how he could have done it more efficiently, later.
And he was very curious how the woman who refused to allow Astoria and Draco the right to be named as Ted's family could justify attending a family dinner hosted by those same people.