Define what you mean by 'Asian' and perhaps what makes you qualified to say that.
If you are including East Asian in that, don't mistake a lack of campaigning as contentment. Even those of us who identify as Western have a lot of Eastern influence that is hard to shake off that makes us reluctant to kick up a fuss, because it's disrespectful/impolite. Don't equate one set of cultural standards with another.
When I speak to my East Asian friends and family, I assure you, we're all bothered. We just don't feel able to speak about it to other people because 1) it feels like we're going against our inherent behaviours and 2) we don't really think anyone else would give a shit.
Chinese people endure a lot of casual racism.
Chinese, Japanese and Korean woman endure a lot of involuntary fetishism. All women have to put up with being objectified, but there's something even ickier about it when you're East Asian.
But no one else cares.
Indian people do quite well professionally. They get a lot of representation in TV and films too. East Asian people don't quite enjoy that same level of success. 80% of the people at the top of my profession are old, white men. The other 20% are old Indian men.
Generally, black people have the freedom and the will to protest and campaign and make their points. Non-black people tend to think twice about doing something that might get them accused of cultural appropriation, or anything else that could cause offence. Black people's ancestors put up with a lot of shit, and the current generations aren't having any of it. I think they're doing pretty well in the UK, TBH, and fair play to them.
But the debate always comes down to black vs white. There are even 'little things' now like brown plasters, because we're sooo inclusive and diverse in the UK.
Other colours exist. Hello. We're here too. Did no one think of other shades?
We're often invisible.
It's a bit like, just because the introverts in the room aren't speaking up, it doesn't mean they agree with the extroverts. You can't judge everyone by the same set of behaviours when trying to work out how they really feel.