Is it bad to keep a horrid message from someone as motivation to stand your ground and maintain your anger?

Anonymous
So I got a very horrid, very snotty, very unnecessary message from the shy guy boyfriend of a girl I was friends with. I still have to see the girl from time to time but I dont talk to her and generally hate her.

So many times in the past she has tried to cause problems and I've forgiven her but this time I don't want to as it was massively out if order.

Am I in the wrong for holding a grudge? And is it bad to keep and refer back to that message in order to keep me riled up and angry?
Is it bad to keep a horrid message from someone as motivation to stand your ground and maintain your anger?
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