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He has been acting in a manner that drives women away for a long time. There's been plenty of time to cut that shit out.

https://geekfeminism.wikia.org/wiki/Richard_Stallman

You may not like the source, but they link to actual examples.

It's the leader's responsibility to create an environment that others feel safe joining.

He did a shit job at that.

I'm in a group he had been fine towards, but I've never found him someone I'd like to follow.

His bad behavior is not new, it's been going on for a very long time, why does he need more time to change? His statement on why he left makes it pretty clear he feels like he didn't say anything problematic.