French person here. Honestly, a lot of tourists on vacation behave badly regardless of nationality. It's because they work hard all year and let loose on their fun trip.
If you want some stereotypes: I have years' worth of memories of very rowdy, drunk Germans at French watering holes! I've never seen an American behave badly, unless you count clothing choices as a crime

The American stereotype is that they're fat and wear unflattering clothes. Paris and Provence used to get mobbed by hundreds of tour buses full of Japanese tourists who would descend on fancy stores and clean them out. Now it's the Chinese.
So let's not deal in stereotypes. You'll be fine abroad, OP. No worries.