Stop Doing That
Some won't take this one serious because it's non physical toward your person, non audible. But enduring emotional disrespect will usually stick around a lot longer.
I could go on with a list of factors that fall under this line of complaint, but you know when your time has been wasted or you've had someone "standing there" for nothing. Be mindful of one another's time. I for one will appreciate it. Whether you're an individual, a corporation or some other entity, I'm talking to you.
Please and Thank You!