please do not tip. otherwise they expect it from everyone.

Not everyone is from the USA and many people do not have money for tipping as they're on tight finances, needs, etc. They do not need to be subjected to the rude behaviour if the agent suspects they won't be getting a tip.

this whole tipping thing needs to be stopped, or be kept to the US. Please don't spead this crap elsewhere. The agents get paid to move people in wheelchairs, etc. That's their job. No need to pay them extra, because they will then expect it from others.