Why do coworkers socially exclude someone just because one person dislikes them?

Myself and another coworker don’t talk because of a situation that happened outside work. Now because we don’t talk a few coworkers don’t talk to me. Like it’s not cool to socialize with me at work. I helped get my uncle (who’s not blood related) in where we work and he doesn’t even talk to me anymore. Only if they have to. I was really close with this uncle. Even people that I was cool with outside work have been different.

Why do coworkers socially exclude someone just because one person dislikes them?
Post Opinion