I am not sure how suing anonymous people on the interwebs is going to get you anywhere, and honestly, it makes you sound like a big baby. The fact is, everyone has an opinion on the net, and anonymous opinions are usually more obnoxious than usual. Honestly, you should just ignore it. Or start a blog/use Facebook/Twitter/etc to refute. Lawsuits seem pretty excessive.
(Thanks, Kelly, for the link.)