Sometimes someone can make you feel uncomfortable either because of what they did OR because what they did reminded you of someone else that treated you badly who did similar things, and that doesn't necessarily mean that the actions themselves were wrong though. Flirting with women isn't the same thing as harassment. Promiscuity isn't the same thing as toxicity.

Honestly, I feel like this was a bit of an overreaction, that guy didn't do anything "wrong" per se, I think his expectations about what's appropriate and what yours are don't align and that's valid and why the unfriend/block button is there, but I don't see anything "toxic" about sending someone a message about deep philosophical topics without wanting to do small talk first. I do that with some of my friends, especially my creative friends.

There's also nothing wrong with being a man who wants attention and validation from women so long as he doesn't go over boundaries that the women set. (Which it seems like you didn't set an appropriate boundary for yourself but that's not his fault). There's nothing wrong with being a man who wants to talk to, flirt with, or sleep with a bunch of women either. So long as it's done openly, honestly and with consent.

If he messages a married woman and she says "sorry I'm taken" and he gets pissy, well that's immature as fuck and warrants a block. But did you even see him do this? Or was it hearsay?

Seems like a reach imo.