Talk about first world problems..."My flight attendant wasn't perfect"...."My FA was too old and shaky".
All while sitting in C.
Obviously, not making excuses for a snippy response from a FA, but that seems like the only legit complaint here, and I question why that is the basis for never flying UA again.
I count myself fortunate as even having the opportunity to fly in C (which I don't always get on long flights), and I always try to make myself as low-maintenance a passenger as possible. That's just how I approach life, I guess -- be as low-maintenance as possible, carry on, let things roll of my back.