Daniel Gildenlow.
He is without a doubt my favorite singer/songwriter and in my opinion one of the greatest to have ever lived. However his personality since Scarsick or so just makes me want to punch him in the face. And he is constantly getting more and more and more self involved, it's disgusting. While I usually wouldn't let it bother me, it's leaking over into his music and that bothers me.
I agree that what he started doing on Scarsick was just annoying. The lyrics in that album just felt like him being on a soapbox the entire time (parts of Be felt this way too though not as bad). What really attracted me to PoS was the personal stories that they had in TPE and RL. I knew he had those opinions back in the day but I don't want it pervading into the music. And hey I even agree with a lot of the things he was saying on Scarsick, it just isn't what I want to hear when I listen to music.
The whole fingerprinting thing really pissed me off. I understand taking a stand about something you believe in. But to do so at the expense of your fans is really giving your fans the middle finger. That's how it felt to me at any rate. And that's really when my love of PoS and Gildenlow in particular began to wane.
In general I hate when artists give their rants in concerts. Maynard didn't bring up any political crap the two times I've seen Tool fortunately. But some of the live recordings of people like Zappa (particularly the '88 tour) were so annoying that I just wanted him to shut up and play some music.