I don't tend to look badly at people who love aviation (aviation hobbies, pictures of planes, flight simulators, etc)...we all have things we are passionate about.
I also don't mind people who stroke their own egos (personalized license plates come to mind). It's not like most guys don't want the hot chick, fast car, big truck, money, or some other thing to inflate their self image.
Even complete uniforms in non-airport locations are okay (ie to and from the airport, like getting a lunch before going to work). However, if you are going to wear the uniform, you should (with maybe the exception of the hat) either wear it correctly or don't bother. A guy with the pants, belt, shirt, but no epalets or tie looks like...a dude with some sort of incomplete uniform. Think about it...how many non-job associated button up shirts have epalets? And no, I don't point that out to people...just a personal standard I set for myself.
Loser pilot I've flown with? I've been pretty happy with everyone I've flown with.
With one (okay 2) exceptions...a married couple. She's a captain and he's an F/O, thank god they've left the DC-10 and are now in the Airbus.
She did SO many things non-standard, not unsafe, but non-standard...and would get pissed at me if I attempted to do the 'standard' thing. Oh, I'm sorry, I couldn't do it your way because YOU DIDN'T BRIEF ME (wait, maybe you couldn't because by the time you briefed me on EVERYTHING you do non-standard, we'd have already landed)!
He tended to know what was going on...right up until a second item would intrude...then HE couldn't keep up. Arrivals and departures were fun with this guy...100% saturated at rotation. Also, he had a fetish against plastic water bottles. He actually threatened my career because I would 'flex' water bottles unintentionally ('crack, crack'). Okay, yes I knew he couldn't actually do anything, but get a grip dude!
That one trip (which is usually a nice week long trip) was a nightmare. It is the ONLY time since I have been with the company I SERIOUSLY considered going sick in the middle of a trip. I also made a notation that if I was ever assigned a trip with either one of them, that I would drop, go sick, or something. They're both pretty senior though, so I suspect I'll never fly with them again.
I thought maybe it was just me until I was chatting with my crashpad roomie and all I mentioned was about flying with a DC-10 couple that i didn't enjoy. Before I proceeded any farther, he guessed the couple's name...because he had a similar experience with them.
Okay, I feel better having vented...rant over.
FastCargo