Can someone provide links to the trolling and the careless and ignorant comments and the accusations of sexism and racism that you're all talking about?

The worst I could find was this from Josh Susser that apparently started the ball rolling: "Nice speaker lineup for @BritRuby. Except for the 100% white guys part."

Did pointing this out drive sponsors away? Or were there some stronger statements I missed?

I saw many tweets offering helpful advice on diversity to the organizers. I saw a lot of discussion about whether and how it is possible or desirable to have a diverse set of speakers. I still haven't seen any accusations of sexism or racism but I have seen a lot of complaints about those accusations which I can't find.

Can someone provide links to the accusations?