What classifies as social media red flags?

I’d say besides the obvious, such as following IG models, following a very large number of women, following women he doesn’t know, sharing or posting sexist content, what else would you classify as an obvious red flag?

Also in terms of engagement, if a man is a potential dating match, what kind of engagement (or lack thereof) would you classify as a red flag? How do you feel about men who never interact with your posts? That is a red flag to me personally as it shows me that he’s ashamed to publicly show that he’s into me.

I also do not tolerate men who reply late with no justification (or even worse if they’re active and not responding). Also, men who follow very young influencers. That’s predatory and they have no reason to do that.