Well, thought I'd just throw my two cents in on the subject. I'm new to the ham radio community, so guess you could say I haven't made "my bones" like a lot of the other OTs out there. But, I had a great old-school Elmer who helped me along and gave some foresight into situations such as these.
First and foremost should be the fact that you, as an amateur radio operator, have a personal "professional" investment in the hobby. What's a few of the first things we learn as amateur radio operators?
1. Do not intentionally cause any interference with ongoing radio operations (unless there's an emergency).
2. Always ask if the frequency is in use before commencing operation on a given frequency.
3. Nobody "owns" airwaves.
As far as I'm concerned, these common sense rules apply to everyone, not just the "New Guys". I work CW most of the time and I know when I was starting out, I committed a few "Fax pas". Most of the time the other ops would work around me, realizing I was a greenhorn. But now and then, an OT would take the time to point out my trespass!
I haven't been in the hobby near as long as a lot of others here in this forum, but, I have been around long enough to experience some of the described behavior. It is frustrating. The next time you have such an experience, try to refrain from breaking out the 'ol .45 and shovel and ask yourself, "What separates yourself from the typical "Trash-Talking CB'ers?".
Ultimately, when you engage in back-n-forth arguments with these types of operators, you are actually becoming what you despise.
Just My Thoughts,