just put yourself in their shoes

That our society didn't even let women take part in marathons at one point and the first time someone did that was by just taking part without making clear that they're a woman and they'll be themselves taking part in it. You can draw your conclusion from that

If there's no difference in sports or shit with men and women, shouldn't we just have one division?

I would think so, yes. I'm no expert on either lol.

If a sport that doesn't depend on physicality still has separate divisions ( literally chess) what does that mean to you?

What is it supposed to mean? I have no idea why it's like that. Here's a relevant wikipedia article. I don't know why you're asking me this lmao, but I didn't come here for an argument. I made a joke. Peace out ✌️