It's a current cultural shift, so that is likely why people commented on it.I am just saying that I think the OP tossed out a light, fun quip that was scrutinized for no good reason.
In the recent past it has been the norm for wives to make little comments and jokes about their husbands being dumb/incompetent and for husbands to make little comments and jokes about their wives being a nag/emotional, etc. I think it's so ingrained that most people don't even realize they do it or they think it's fine because they believe that's how everyone else talks about their spouses. I think for the last few generations it was considered a way to bond with other women or other men by complaining about your spouses.
I don't think anyone was attacking the OP because it's fairly clear that the comment wasn't malicious. I think others were just trying to point out that those types of comments/generalizations/stereotypes are becoming less socially acceptable. So, instead of having desired effect of bringing women together (which seems to be the way the OP was intending it), many now find that type of comment off-putting.