... his role in the incident which saw both him and striker Loic Remy sent off at the end of Tuesday night's goalless Barclays Premier League contest at Carrow Road.
The duo were each shown a red card by referee Chris Foy after exchanging pushes and then squaring up head-to-head on the touchline.
Pardew felt the referee had been left little option other than to dismiss both men, but slammed Johnson for his part in the melee.
Alan Pardew: "There is a bit of pushing and shoving the players have come together, there is probably just enough for the referee to send them off, but Johnson's reaction to the heads meeting, in terms that he got a headbutt when he did not, was the catalyst for them both to get sent off.
"It was his own fault, if he had not have done that then maybe the referee would have taken a more lenient view, but he made such a drama out of it, he should be ashamed of himself really.
"We won't appeal, because I think there was enough for Chris there, but once he done that stupid reaction, the crowd went all mad and he (referee) has got no choice really.
"That was the thing the game will be remembered for, when it should not have been because we had some outstanding performances, and I cannot understand how we have not won the game."