Most business travelers on my flights are very nice, friendly, and keep to themselves. I'm traveling almost every months these days and have yet to see someone go full elitist and ignorant mode during my travels.

Traveling is frustrating and stressful in general. So, I guess when a biz traveler is booked in biz class and has status, there's some expectation that things go smoother than if traveling with no status and economy. As others have mentioned, airline staff are not without blame either when they do not know their own policies or deviate from them.