I dont think it really matters if someone posts anon or not....I mean, I just treat them all as the same person if the start sniping.
Seriously, there are people who've been posting here for YEARS under any certain name and avatar and I couldnt give you the first clue who these people REALLY are. I mean, I still get PM's asking me who I am and I use my real name, not to mention its been posted throughout this place repeatedly over time. I know who Ginger is, I know who Morli is, and RTP....and now 85...thats about it, yet lots of other people I discuss things with use a consistent name and avatar.
I dont think you should let it bug you so much about anon posters, a funny little picture doesnt add any credibility to a persons rantings against you, other than you can identify their rantings more readily....it doesnt mean you are gonna agree with them more or less or accept them as legitimate. You wouldnt take it any less personally if the person was identifiable, ya dig?