You know what makes Brian so unlikable? Shinji is Shinji he's not putting on a act or doing a bit, Tay is herself she's not pretending to be another person, same for Jimmy and same for Trish. Brian always feels like he's trying to be this cool guy badass he clearly isn't. That's what makes him so unlikable. You can see it clearly in the group therapy sessions where he tells TJ to assert himself and he is pretending to be some kind of alpha coach jock person he isn't. Everyone else is just themselves and he's doing this really bad performance thing that is failing. Brian seems so desperate to be liked by the audience he can't be himself.
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I respect authenticity over someone playing a character any day.