Bellamy clashed with a fan at Old Trafford following the dramatic 4-3 defeat to Manchester United.
“I did not see it but the guy should not have been on the pitch. That is not acceptable,” said Hughes.
“I seem to recall Brian Clough clipping someone around the ear and he was lauded as a national hero. Maybe it will be the same case with Craig but I doubt it.
“I’m sure people will make a nuisance about it.”