mr sha knows those facts:
1, 100 years ago, british defeated qing.
2, 100 year later, hongkong is the most prosperous region in china under british rule.
3, could mr sha use same rhetoric to any corrupt chinese bureaucratic? no, he dare not.
4, what can mr sha gain (or can chinese gain) to yell to westerner? nothing. it exposes his void.
5, all chinese work hard to make cheap good for westerner while he yelling.
in all those sense, he is opportunist, disgracefull and coward.