It's probably like all the bolshy pax you see on programmes such as "Airport"
Arguing with the check in staff, shouting, swearing etc, so of course the staff don't make that extra effort to help.
What you don't see are the 99% of late passengers, who apologise, and ask nicely, and then either get on their flight, or get transferred to the next one.
But then again, that wouldn't make good viewing!