I don't know what was said at the meeting. But Singer did start making comments about white supremacy in America at a meeting about banning political discussion at Basecamp. I could see how it looked like his opinions were given more respect than others.

If he made statements about white supremacy not existing at basecamp, then that was a horrible defense to accusations of white privilege at Basecamp. Shutting down discussions over arguments about phrasing makes it looks like Basecamp would prefer just to ignore issues with discrimination if they did exist.