LOL, flipping off from the other room! I love it, so I'm not the only one who does stuff like that!!! Sometimes, when he's not here, I will go into "his" room and dance around, and say/sing, "I'm in your room, I'm in your room!" It just gets annoying all the door shutting, it's my freaking house too, I can go into any room I want. Doing that helps with my anger.... also yelling at pictures sometimes helps.... especially at the holidays it did.... pics of him, his dumbass mother and brothers..... very therapeutic.
Also, is it just me or do they do things to try and start fights or try and get reactions, even though they claim they don't care? Just curious..... stuff he's been doing makes me think so, like doing or trying things I've wanted him to do or try for years... but I don't react to any of it..... I just ignore and go about my business.... and deal with my anger and hurt later.