One day you told him that you aspire to be like him, Trevor shook his head and turned around

Look kid. You don't wanna be like me. It's not good. You might think the guns and the cars are cool and worth it but it's not when half of your friends are dead and you have no stable living and in and out of prison, ok?

Yes Trevor did bad things but what he did was see the wrong in things and he didn't want to be idolised for commuting crimes. Especially to basically his last family he had