I would bet on there being fewer rapists among MTG players than among a random group of people.
Basically everything I know about MTG communities, nerd spaces in general, rape culture, and misogyny would disagree with this. Obviously I can't make a rigorous, provable argument for the opposite, but MTG play groups can be pretty toxic spaces for non-men.
I guess there's a chance that more people would be okay with rape in these communities, but less would be bothered to actually go out and be rapists.
I can't imagine those people would be 'okay' with rape as much as it is a jealousy and entitlement about not getting 'some pussy' or something like that. The worst of nerd culture (as you refer to) seems to be a bunch of immature beta, alpha wannabe twats, of the whiny 12 year old CoD variety, but that's a bit stereotypical, and too dismissive of me to really accept myself as an answer. And well, there are a number of more things to ask or discuss which I wrote down, and then well, this is sort of an RSP topic, so I deleted it all. :p
Back to your regularly scheduled programming?