generally the British attitude is to laugh it all off and tell them to go fuck off somewhere else which is the generally accepted thing to do here, as no one has guns and anyone who is full of hot air has to find somewhere else to fart their political pomposity out. they tried playing the racist card while waving Chinese flags and telling the piano player that Chinese law operated here...

But no one knows what's what anymore so the coppers pick on the liberal plain speaking British public as they try to enforce the will of the right wing political masters the Tories who for a long time worshipped Trump and his love of authoritarians like Putin and Netanyahu and Kim Wrong 'un.

The message here is we're China and we'll rule you and intimidate you from afar. and we'll use your clueless English bobbies to suppress and intimidate you.

'fuck off' is the only reasonable response to offer both the old Bill and the victims of the piano. not a bad version of 'trouble in mind' either from the other guy who played.