Don't underestimate yourself. It sucks to fly with a guy who complains about his life for hours on end. Thankfully very few of us are like that. Sure, there are universal complaints at UPS; NURPS, schedules, catering etc, but you'll go nuts if it consumes you.
I like my job and the people with whom I fly. I do the job, vote in elections, and follow the IPA guidance. I don't rip the IPA and my union brothers the way Frontseat does and I wouldn't post his name on a forum either.