The Vine clip alleged that the guy held up a sign that said "You can't sing," but the full video shows otherwise.
In the full video (starting around 3:08), Beyoncé does an amazing run, then has an audience member repeat it. When he gives it his best, Bey says he got it "exactly," which has to be an amazing thing to hear from your idol.
"I paid $1,500 for those seats," Robinson said, "and would never say such a thing."