Thanks for the understanding reply Scooby, can I say in defence of point 1, there are certain freq changes that appear to require the antenna to retune somehow and that happens when the 'transmit' trigger is initially pressed after the change. I have waited a couple of seconds after a freq change and on pressing the transmit switch/trigger suddenly a voice is heard in the middle of a transmission. If you're quick enough not to speak and let go then its a minor interruption but if not....
There should be no acceptable reason for a pilot to be offensive when talking to ATC, I apologise on behalf of those who are or have been.