Realistically it would probably be an Afghan scenario China announces blockade US along with West runs its mouth but too chicken to do anything about it some naval PR stunt from both sides, West pretend annexation didn't happen on technicality and claim did nothing so to preserve peace, Go back to business as usual and prefer not to talk about it but society wide there would be a silent acknowledgement and understanding among westerners, would be very similar to how Japanese got treated after War With Russia nobody wanted to talk about it but if a Rich Chinese merchant wanted to avoid harrasment and bribe when returning home after closing shop from European police in the streets in South east Asian colonies all he had to do was to hire a Japanese prostitute then nobody would dare to approach or disrespect you,no more of that passive aggressive pettiness, Taiwan effect on Western society would be similar but probably much more subtle,widespread and deeper.