I wouldn't call any police action "polite", but the worst I remember reading about was a 24h detention of a crossdresser that was caught on security cameras by building administration while doing self-bondage videos. The security camera feeds were shared live with the other residents until the police arrived. That person described the policemen as "polite" in the uploaded video.

I trust it more than other internet posts, as it's a first-hand description. It also mostly matches what @yanhangyhy wrote here.