I can blame the controller. I myself am very good at Halo and games in general really and i too work in the games industry (freelance concept artist: anonymous too for contract reasons). The 360 controller for me compared to the DS3 seems a little too wonky for me to get the correct movements. I often find my palms or thumbs slipping to where an opponent is able to get the best of me at a melee fight. It is partially because i am so used to the DS3 that its taking me some time to adapt back to the 360 controller again. And TEA being more of a PS3 player than I; I can see where the controller would be an even bigger issue for him.
Let it go man. You dont have to back yourself up against everyone who talks about you poorly. Just breathe and ignore it. Best solution.