Often it's more like not respecting the sanctity of the line. Americans got the tradition of the queue from the Brits. It was a source of constant annoyance when I lived in Germany when people would cut the line and others just let them without objecting.

It's pretty common in most countries for things like waiting for the bus to not queue and in some countries people won't even queue when the bus arrives and they're trying to go in, and instead just try and jostle their way in.