I think my friend doesn't deserve disability benefits
It your friend not actually disabled?
He does qualify for the benefits but I'm sure he would be fine without them.
It's nice that you think you friend is capable enough to live without those benefits but you shouldn't judge his situation. You don't know exactly what he's going through and it's not your place to decide if he should have those benefits. Be happy for him to be able to get the help he needs if anything.
My friend was always an asshole and never cared of others. He should be kicked to the curb instead of helped.
A persons past should not take away qualification for a legitimate need.    Maybe the need for disability will humble him and change him for the better.