Please don't get me wrong. You're in a group of people who "know" you and that is QUITE a bit different than running down a road and telling someone you feel their choice of vehicle is worth pi$$ing on. The graphic isn't offensive so much as the message behind it. Someone posting that same graphic in a setting that is friendly to begin with like here or another forum, is a different setting and conveys a different message. More of a "Nya, Nya, Nya, Nya, Nyaaa" thing.
Put your avatars back, they don't offend here where there is context.
On the TruckNutz thing, I was given a pair of these from a buddy who knows me very well. He keeps asking why I haven't attached it yet. I keep trying to tell him that it's funny between us, but I don't want to have my mom, my daughter or anyone else's looking at that sort of thing.