Really? I've never heard Simmonds labeled dirty. Even other teams fans usually don't describe him that way. Gudas they do, or used to.
Simmonds is not at the level of a Malkin or Wilson but he is involved in 1-2 questionable plays a year where other teams' fanbases are calling for suspension. He also gets more than his share of extra shots in after the whistle or away from the play.