From talking to friends and relatives from HK I've seen huge diversity in how people think about HK, China, their relationship with each other, Mandarin, Cantonese, food, and "the West".
There are certainly large groups of HKers who would prefer for HK to seced from China. There are also many HKers who love the UK and mourn the loss of HK to China.
There are also huge swathes of the population that chaffed at being colonized. Long time residents can show you the old police barracks where British troops would beat the locals in black bag operations. They'll tell you about how the feng shui of the Bank of China Tower lead to the collapse of the British empire. They'll tell you that they spent their lives paying taxes into a "democracy" they never got to vote in.
The opinions within HK are far more diverse than we make them out to be.