Great venue and until tonight I had nothing but go...

Great venue and until tonight I had nothing but good to say.
During the intermission we took kids to the little snack & drink bar. There were 2 little girls in front of us, first in line. They stepped up to the counter to see the choices, just past a sign that said, "line starts here" And that idiot behind the counter went full Soup Nazi. He wouldn't wait on them till the went back into the line, behind the sign. Of course they were confused and went to the end, several back. He called us to be next and in the moment my mind was processing what I saw, so we just stepped forward to be served. I should have made him wait on them first. What a dick.