There are good and bad in every job - after all police officers come from society .....
The caution as you get out is standard and not a scare tactic - something the law now requires .....
I am a traffic cop - but like most in traffic I love cars and am realistic about 'nice' cars, roads and drivers

I got stopped a couple of weeks ago driving my dads 20 year old Metro (whilst waiting for the Ed 30 to be delivered !). The guy who stopped me (100m from where I had just finished work!) was polite but kept me waiting for the checks to come back as he didn't think I had insurance. I just wanted to get home but at least he was polite.
As for making off .... not hugely advisable - it's not just Stinger you have to worry about but TPAC .... i.e. ramming/blocking of your pride and joy. I am sure most people on here wouldn't consider it - I hope !!
If you are not happy with the way a police officer talks to you or they are plain out of order with their manner - and I would stress that you haven't 'asked' for it ..... then complain - simple as that. All complaints no matter how minor are dealt with and the officers Inspector will get seriously fed up if he keeps getting complaints about an officers attitude to deal with .....