a lone wolf
A lone wolf is a person who prefers to be by themselves and hates people who talk too much or breathe too loud.
My cousin is a lone wolf. He sits in the corner of the party and eats pizza like it's a war crime.
She doesn't even want to be friends with her own dog. That's a lone wolf.
He left the group chat because they all laughed at his memes. Now he's just a sad guy on TikTok.