I hate my brother in law

My husbands brother is currently living with my in laws. My husband is REALLY close to his parents, as in they have a very close relationship.

I hate his brother. He can’t keep a job, he treats his kids like crap, his parents like crap, and basically just plays video games all day.

How do I deal with the hatred I have for him when I’m forced to go visit with him. Watching him being mean to his kids and family is just so repulsive and seriously triggers my anxiety.