Going against the grain: I think it's a little weird to say "I like kpop" if what you mean is "I like [group]." Just like it'd be weird to say you're super into rap music, but in actuality, you only like Eminem. Or that you're obsessed with makeup, but actually you only sometimes put on lipstick. Or that you're a huge car guy, but what you mean is that you think Teslas are kinda cool. I kinda feel like saying you're into an entire genre or subculture means you'd have at least some base familiarity with the genre/subculture, but if you only follow one act in the whole genre, then... you don't like rap, you like Eminem.
It doesn't matter in the grand scheme of things, but if someone told me they "liked kpop" and I tried to be excited with them, and found out they had no idea who any of the major acts are, none of the new releases, had no idea what was meant by "YG" or "SM," and it turned out they heard Gangnam Style and liked it... I would walk away from that conversation thinking they don't like kpop, they like Gangnam Style. And that's fine, it's just very imprecise to say otherwise.