Great thread. Welcome to FT, A380US.
Lately, I have had a small amt of flexibility with days, times and sometimes routes I travel so to the best of my ability try to avoid full flights, busy travel days and bad weather. This seems to eliminate the majority of travel related problems and most stress. The lower stress understandably makes for a pleasant flt. Consequently the GA's anf FA's are relaxed and usually very pleasant as well.
As TVCH said, a well reasoned but respectful point is far more powerful than a temper tantrum. I can only remember one recent major snafu that I got fairly upset over and that was w/ Air Tran in ATL with the CS folks, but even then I kept my cool. I think anger is counter productive 99% of the time.
The regular GAs that I know on my routes are great and bend over backwards for a "low maintenance" passenger.