Years of living with family has been frustrating. He didn't have kids he had freedom while bad parents left their kids with grandma. He was single not in a pointless power struggle relationship. Working to better his life not have kids that he couldn't afford. Paid his share of rent while everyone piggybacking off grandma.
When they partied they blamed him. If he was to go out he'd get a guilt trip by people that didn't work. Trying to make him seem like the bad guy because he wanted to live life outside of the chaos.