We joke that my parents found out what was causing it...
lol...
I imagine you could say the same about my grandma, who had four kids in as many years beginning immediately upon marriage, but her 5th 5 years later... (Italians over here).
But in general, as someone said early in the thread, stereotypes exist for a reason: the basic facts (for example, that families of certain religions tend to have a lot of children) are true, on average. If someone brings them up, the insult (or not) of the thing is all about how that is done.
For example, I could call someone "a stereotypical (Religious group), contributing to overpopulation of our planet and setting Women's Rights back 50 years," and that would be rude (also note: not my actual opinion). But if I'm telling a story about my French professor, and ask you to imagine "a stereotypically g
ay French man" while going on to describe how good a teacher he was, his passion for his subject (french film), and the way he would always drop into English to say "Iz zat cooool or wat," it should be obvious that I'm just painting a picture for you--indicating that he was flamboyant, good looking, a good dresser, etc--not implying anything negative about either homosexuals or french people.