I think these days with the prevalence of smart devices, even if you're pretty vigilant on keeping them from exposure to internet bullshit, they're going to get second hand exposure, and you can't really cut them off from social circles without dire consequences perhaps worse than the second hand exposure itself.

I think you've got to keep a pretty even temper and maintain good lines of communication with your kid, about the only way to navigate now. You want to keep your kid open with you about what they are hearing and seeing so you can help them navigate it. If you aren't careful they'll close up and not tell you anything and then they're going to only get their guidance from the internet which is stupid.

Still can't allow dumbass stuff. If the kid wants to play pretend they are a fox or something whatever, that's normal kid stuff, if they want to play pretend they're a fox or something during class or at the bank or something that's a hard no, time and a place. Foxes don't go to school. They also don't get to eat dinner with the humans. If you want to play fox at the dinner table go into the basement and eat some rats like a real fox.