If Martin was really the "Big Weirdo" on the squad then its very possible that Richie Incognito was his best friend and his worst bully on the team. If he's alienated himself from everyone else then maybe Incognito was hanging out and joking with him everyday...and also running his pockets, clowning him in front of the team and calling him a half-****** fakkit etc etc...just cuz he's an @sshole who likes taking advantage of people.
And if you're Martin, an already awkward dude with no other friends you'll be cool with Richie on "good days" and probably hate him when he's shytting on you.
It happened to me in middle school lol. A kid who I wouldve sworn I was cool with told me he wanted to kill me cuz I kept picking on him. I assumed we were both in on the jokes

. Everyones personality is different.
One of my best friends to this day is a dude I met in college who everyone thought I had beef with cuz we would clown each other all day when we were chilling. We both "got it" but other friends would be like "you know ____ is gonna be there, you sure you wanna go" and we would both look at them like
This whole situation is very middle school status on both sides.