I don't think there's anything we can do about that, any major audience website gets its fair share of stupid comments. Look at osnews.com, linuxfr.org and now distrowatch weekly... it's gone to a point where I don't ever read the comments on osnews.com, I don't even visit linuxfr.org anymore and I'm starting to think I might not look at the comments section of Distrowatch Weekly.
They're not only bashing PCLinuxOS, they're bashing Ubuntu, Mandriva, Fedora, Suse, every single distro which gets too much attention. They're even starting to criticize Distrowatch itself and the way it ranks and groups the distributions.
Distrowatch is a great website and it's really handy and full of precious information. Distrowatch Weekly is also a very nice read and one of the few things which brighten my monday mornings... but I wouldn't recommend to anyone to post in the comments section, especially not about Linux Mint. This place is turning into a distrowar mini-forum and I'd be obliged to anybody not to mention Mint in there... we really don't need that kind of crap.