I think part of the problem is that in the CoC context, the slighted party now looks at your username, cross references it against reddit and twitter, searches your posts for something else to take umbrage at, and makes the case that you should be excluded from the community. The result is a very real chilling effect on speech on all public platforms because now you're never allowed to make a comment that might be taken out of context to offend now or at any time in the future.