The "you like this" is the one that gets me the most. I am like, "no, I don't like your piece of crap." I want to write "unlike" on top of that sticker the next time I see it.
Had a Scion tC with a big "you like this" sticker on his rear bumper near the exhaust tip cut me off last year coming back from the beach. AWWW HELL NO!!!!