But his parents is supportive compare to most asian families tho? It's weird that they know their younger son but not know their older son to teach him better. It always starts with the parents first
I interpreted it in the sense that the parents are okay with mc being gay (you're right about being them more supportive than other families), but the parents should've put his older brother into therapy or treatment or whatever for getting into fights and getting his little brother hurt first of all. but if they did all that, and the older brother still didn't listen to them, him being homophobic is not going to be the first concern on their mind.
my younger brother is kind of homophobic and that's not on my parent's behalf; boys that age are very often entrenched in that homophobic culture that often leads to stuff like red pill thinking that can unfortunately influence young boys easily, and while it is the responsibility of parents to steer their children on the correct path, once they get to a certain age like 14-17, they start placing more emphasis on their peer groups beliefs over their family's.
how a lot of asian familial dynamics work. and I'm saying this as a bisexual south asian. there's a pervasive form of homophobia that is rooted in modern asian families, largely as a result of colonialism; for those of you saying "why didn't the parents teach him not to be homophobic" because the parents very likely didn't think of homophobia affecting one of them as a day to day issue, and the brother is a guy that gets into fights. I agree that the parents should've stepped in to stop the physical abuse.
but ultimately he's one of the lucky ones for not being disowned as soon as he came out. I can say this from experiences; my friend group is primarily queer and multiracial asian, and all of us are closeted to our families.
don't take me as defending the brother, he's a piece of shit and mc definitely shouldn't go to that wedding. but asian families very often place family over independent feelings. it's different cultural norms and you need to look at this with a different pov.