They couldn’t sympathize with you because your belief that your GM was somehow abandoning you and traumatizing you was delusional and other people simply cannot understand another person’s delusions. That’s one of the things that is just characteristic of delusional thinking. People find it really weird, probably a bit scary because they don’t understand it, and naturally distance themselves from someone who is delusional for their own personal sense of safety.

You perceived their response as rude. Maybe they were even actually rude, but that was due to your odd behavior over a delusion. On the other hand, your rude response was a real behavior directed deliberately toward them in retaliation for their response. Your delusional thinking and rude behavior has consequences. Coworkers don’t have to put up with that kind of treatment and they won’t. They don’t feel any personal stake in a work relationship.

Your off putting behavior was originally your delusional thinking and expectation that coworkers would understand it and sympathize with it; it wasn’t rudeness that turned them against originally. It was simply really odd behavior that they found probably weird and a bit creepy.

You seem to believe only rude or mean behavior should bother people. Often it takes much less or different from that for people to get that vibe that they need to avoid a person.