Past tense. Continental pilots were arrogant during the days of Bob Six when Continental was THE airline to fly for. Continental fell quite a bit in the next couple of decades and I don't think that the pilots are arrogant anymore.
That said, United's pilots used to be arrogant. The last decade has placed most arrogance in check - save for a brit who cheers for Man U. There are probably a few more than that. But I'm sure if I dig through Continental's seniority list, I'll find the same.
Like it or not, Continental's pilot group has its own shortcomings; your comments about United pilots is akin to the pot calling the kettle black.
Now here's the bottom line. You, I and every Continental and United pilot will fly on a single seniority list one day in the not too distant future. Infighting over petty immaterial issues only hurts us as a group. It's especially troubling when someone makes an unprovable claim about the other group. Stop it.