Uhhh, no.

Just because I'm not part of the 2% of people online who use ITA=I totally agree doesn't make me a intarweb n00b.

In addition, I've seen PITA used on message boards and blogs. PITA=Pain in the Ass. So if we're going to be using ITA, it makes more sense to use ITA=In the Ass...you know, just to keep things consistent.