You seem to think that the normal rules of human interaction don't apply to interactions with police officers ... they do.
Anyone challenging any professional's actions, judgements or statements without thinking about how best to do that is likely to get a bad response. Think of your last encounter involving a challenge to a call centre operator ("If you raise your voice [in frustration] I'll terminate the call"), bus driver ("Get off the bus then"), restaurant chef ("F*** off and f***ing die you c***" (it was a special treat, we'd gone to Foxtrot Oscar ...
)), etc. etc.
It would be nice if police officers and PCSOs were different ... but they're not and so any "in your face" challenge, especially is accompanied by an inaccurate or (more usually) incomplete "I know my rights" type diatribe is likely to lead to another turning of the attitude - behaviour cycle. (Something I would like to see more training in given to police officers - their conflict management training is absolutely minimal ...)