Some customers get so upset when I explain to them that I have a queue of other customers that I'm helping.
Like they're offended, as if I don't care about my job. Pisses me off, because while you're complaining about my lack of work ethic I'm the guy at work while we're understaffed because other people have decided not to work. I'm the guy who showed up, and I'm overloaded, and people read it as I'm lazy because it takes me a long time to get back to them.