People who say they 'smurf'

Hey so today i was playing my last game of the day (trolling a bit)((its normals dont worry)) when this ZED (its always the assasins) starts getting ganks in my lane and so on. I make a joke about him getting babysat and he (his first language not being english) takes it the wrong way. I mute him blah blah blah. And then at the post screen game he has his teammate sucking up to him when he says im a challenger smurf. I ask for his account name, it turns out to be false. My question is, would saying you are a 'smurf' in this context be similar to saying ez and therefore a bannable offense??
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