OP, I think you mean "Why does it feel like Blackpink is more accepted in the U.S. than BTS?" That's probably why your repliers are confused a bit; they think you're saying Blackpink members themselves think they're more accepted in the U.S.
To answer your question, I sense this as well. Asian celebs in general have an uphill battle in regards to fitting in and being accepted, but the hill is steeper for male Asian celebs, especially those coming from a K-pop background. Male K-pop idols are ridiculed for not looking conventionally masculine enough; everything they do is scrutinized by many western men and women who aren't used to Asian men being portrayed positively.
Female K-pop idols sadly have their own battle because they're sexualized and fetishized in the West, but you might know how the West is when it comes to that. They have no problem pushing that objectification.
Statistically, Asian women are the most desired on western dating apps while it's the still opposite for Asian men.
In short, both struggle to assimilate, but in different ways.