Well for one, and not speaking for homie but just for myself, I don't give a damn who another woman or man sleeps with. Thats' on them. Like I said earlier, I know a black woman sleeping with a white man is a crime punishable by death on here, but I don't abide by those rules so we'll never match up there.
As far as the show itself though, that aside, Sam is the one character who has a relationship with a white guy and she's hardly the main focus of the show. If anything, I'd say she's the least interesting character on the show and what makes it work is the ensemble nature of it, following different black students as they deal with life on campus. None of them are tragic, none of them are begging for white people to accept them, or asking for anyone to be less than what they are. It deals with police brutality, identity, a biased educational system, our music, our slang, and how our culture has evolved over time and what that culture is in 2017. And it doesn't go for easy answers. Sam has a very different idea of how to deal with racism and prejudice than CoCo does and both of their arguments are valid. Troy and Reggie are looking at it from the male perspective but from different factions as well, with Troy being the son of the school president and being groomed to be the next president of the united states but having to squelch who he is and what he really wants to appease his dad. Reggie is more than meets the eye showing that still waters run deep and black men can be interested in a myriad of things and aren't stereotypes.
If you don't like the show that's cool though homie, everything ain't for everybody, but its not this thing you're making it out to be. But at the same time, if you can't get past Sam having a relationship with a white guy, then it probably just isn't your cup of tea.