The point isn't to figure out whether these communities were a net positive or negative. I wasn't a target of any of the racism, sexism, homophobia, etc on these forums and chat rooms but I sure saw a lot of it everywhere I participated at a level that was kind of ridiculous in some cases. It clearly had impact on the people it was targeting, the degree to which it "clouds a persons recollection" is entirely irrelevant.

Is your point that their recollection should be dismissed? That they were too sensitive? It's unclear what this response's intent is.