system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why men are not allowed in playgrounds?

I went to use the bathroom and my dad waited outside. A group of moms was arguing with him and threatened to call the police. They pointed to a sign that said no adults without children are allowed. They backed off when I came out. I know it's weird my dad stays at home, but what's with the anger?
gpt
Sexism.

One of the major sexist cultural towards men in the US is thinking that they're more likely to be pedophiles and that it's the only reason a man would be around a playground.

So the women were being sexist, and hassling an innocent man because of it.