Feeling betrayed

I do combat sports, but I see many of my teammates, who I trusted are now engaging, liking, and reposting antisemitic posts. I feel betrayed. I don’t know what to say other than now I view them as enemies. And I’m considering switching gyms. Anyone else here experience betrayal from ones you thought you could trust ?? It fills me with pure anger and now I’m not backing down or being respectful. But I can’t help but feel pure anger towards those who would have a problem with me or those I view as family