I looked at this only because I thought that it was a really odd question...it is, really,
but, I, too, find myself annoyed with the UP. The petty model RR decoration/copyright
thing of a few years ago did not help, but it's something subtle. Not sure what.
I find myself shooting photos of locos - and skipping the UP ones - and not even
really thinking about it, typically. "Oh, it's only a UP SD-xx".
I don't like the paint scheme, though I like yellow and I like gray. I love my Veranda
turbine, in -spite- of it being UP, not because. Heck, I'm a NYC fan, but even the PRR
doesn't annoy me. Much. OK, a bit.
Anyway, it's odd - and, next to the Southern (at one time), the UP has done so much more than any other RR about steam locomotion in the US that I should really love it. But I don't.
I do know that I connect the "Union" Pacific's origins with a time that ended
badly for my part of the country. That's part of it.