Yeah, Dawkins has said some shitty things about women before. There’s tons of material about it online if you type “Dawkins sexist” into Google. He’s also anti-choice and extremely anti-Muslim (I mean, I guess that comes with the territory of being an outspoken atheist, but some of the things he has said about Muslims in particular are unbelievably offensive).
For the record, I believe it’s possible and allowable to enjoy the work of people who’ve done or said problematic things (hell, I am a huge fan of Dan Savage and he’s done a lot of things that offend people) as long as you recognize why they’ve offended others and you don’t try to belittle/invalidate others’ feelings about them. So don’t feel like you have to be anti-Dawkins because of this. Just be anti-Dawkins’-shitty-comments.