Your SIL deserved what he got for aggravating her while she was minding her own business. He sounds like a real piece of work.

My daughter's cat hates my freaking guts because I trimmed her nails once when she was in a bad mood. Now everytime I want to make nice she hisses and growls at me. Even when I have treats or canned food to give her!!! Now I let Amy's fiance' trim her nails. I can't be bothered.