Something else that I do, although rather bizarre is let my imagination go nuts- for example, I think that a saleperson is being rude to me, rather than let myself feel slighted, I visualize the absolute worst behavior imaginable, then I either moon them, or give them the raspberry.. (in my imagination)I said it was bizarre, but for me this breaks the “spell” so to speak.
Another trick I have is to ask myself if the other person’s behavior is life threatening, physically damaging, etc. If it isn’t, then it isn’t worth a second thought!
I think as a very overweight person, I used to let my perception of what people are thinking govern my behavior (turtle like existence) to the point I really didn’t like me much. The more active I become, the more that I want to be an active personality. By nature I loathe going into public situations, but I make myself get involved. The more I get involved, the easier it is. To my surprise I find that I enjoy myself too!! 
And of course Manx the wonder kitty!
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