I'll tolerate rudeness by police if it's an emergency situation and there's no time for niceties, but not if I'm sitting in my car quietly enjoying my lunch.
That is sensible.
They can politely ask what I'm doing, by all means. But randomly asking me for ID, assuming I'm guilty....
First of all, its not "random". They were suspicious and rightfully so.
Secondly, asking for your ID is not a charge of guilt.
Once again, people being obscenely offended by a police officer asking for their ID. FFS get over it !