So I put some tweets in another message, but they weren't exactly the ones I was referring to; like I said, search is difficult on a phone. But I didn't want to make it seem like I was misconstruing what was said, so I wanted to post some clearer ones as well:

"@47deg Hi, are you still going to sponsor LambdaConf if they give a platform to someone who thinks blacks are suited for slavery?" - https://twitter.com/ekrubnivek/status/713501535515226113

"@andrewfnewman @adrienneleigh So, the racist organizers of lambdaconf selected his talk knowing who they would get? Smart move, clearly!" - https://twitter.com/extempore2/status/714502151884505088

"If you've spoken at LambdaConf: have you repudiated its organizers for making the choice to include bigots and exclude marginalized people?" - https://twitter.com/fatneckbeardguy/status/71280436894525030...