This is one of the few secrets that has made me the least bit paranoid. I know it's not about me because it doesn't describe my behavior well enough, but it's close enough to give me pause, though typically if I say "I'll read it!" then either I actually do or I just forget.
I'm a bit more lax about this when I'm anon because I know the person can't be waiting for *my* comment, and sometimes the fics I'm linked to are just so unpleasant for me personally that I back-button away and want to pretend like the whole thing never happened. There are times when a certain fic just reads as utterly OoC to me but I can't find a way to explain it without seeming like I'm hating on the kink being used or something. I mean, I guess I could say "the way this has been done seems utterly implausible" but I just really hate tearing fics apart and telling the author that I pretty much hate it at its core. I'm much more comfortable critiquing a fic that has some things I really like and some other things that could be fixed.