Is there a personality type that causes other people to involuntarily treat that person badly?

My brother has been treated badly recently by me, his wife, and our father. His wife said it best (paraphrasing) "He's such a wonderful husband. Why do I treat him like the poo on my shoe?" This is how I feel too.

I am going to get some therapy for this issue, but last time it didn't help.

I'll appreciate any ideas.