Calling everyone and everything stupid just because you disagree with them is stupid. There are different rules for different airfields, and many times some of the people are ignorant of the rules. That doesn't make them stupid. Causing a distraction immediately behind a pilot with a plane in the air is just rude behavior, but I would think the proximity of the distraction to the pilot would have to be a factor in whether I'd consider it worthy of mention. If there was a guy behind me, holding his plane in his hand and revving the engine while it was pointed directly at me, I'd be a bit nervous as well. In that situation, if there was someone nearby I'd call them over and ask them to tell the person behind me to please move as he was making me nervous. If he didn't comply, then I'd have a very serious talk with the safety officer and let him handle it. If no one was close by, I'd land on the next pass and ask the guy to please move to a different area. Most of the people I've met in my limited time in this hobby are more than willing to help you if asked. By moving to a different area to test his engine, he would indeed be helping you.

Also, if you are in the air and the wind changes, you have every right to change the active runway to one more favorible for landing.

"2. If you took off on a given runway, you have committed to flying that runway. If there is a crosswind, too bad. The other runway is inactive, land on the runway you took off from."

This is just wrong in every way possible. Forcing someone to land in a crosswind condition that developed while in flight is unsafe at best, and could result in injury to bystanders as well as an expensive rebuild. Calling out your intended change of runway did get the father and son to yield the runway to you, even if they stood a bit too close. I'd only consider them in an unfavorable way if the club rules prohibited their use of an inactive runway while someone was flying on the active runway.

Of course, everything I said here is hindsight. It's easy to look at a situation and say "If that was me, I'd have....." No one knows exactly what they will do in a given situation until they are faced with that particular set of circumstances.

Then there will always be a few people who will push the edge of the envelope and bend the rules to the point of breaking, but never quite crossing the line. Those are the people the world revolves around and the rest of us should learn our place and let them do as they please. (just a tad of sarcasm here)