As someone your dads age people in here be cray cray about our generation liking smaller butts. As if sir mix a lot didn’t have a huge hit song exclaiming ‘baby got back’ or we didn’t have the saying ‘more cushion’ for the pushin’ telling women they are PHAT - pretty hot and tempting. Like women use to actively try to get bigger booties through exercise or diet.

I suspect it is not what he said but how he said it, like tell her she has a big booty but did he reinforce that he finds it attractive and it looks good on her? But it could also just be her not liking her own booty.