That is exactly right. And it will even go further. Someone will see your twitter feed/blog/facebook/whatever kids are into these days, find something "offens

That is exactly right. And it will even go further. Someone will see your twitter feed/blog/facebook/whatever kids are into these days, find something "offensive" about it and complain about you on the Github project you're part of (and probably to your current employer and your mom). Maybe the project owner will try to say that the CoC only covers what happens in the repo/chat, but the "victim" will explain how she doesn't feel "safe" anymore working with you and you will be kicked out.