We are saying basically the same thing. I'm arguing that "being mean" is OK and should extend to physical defense of one's right to live without gross opression.
Being "mean" in this way HAS stopped fascism in the past.
In the history of fascist movements, being mean to them hasn’t stopped their political actions or their motivations.
That alone hasn't stopped them, but it does play a real part. Even just looking at resources alone, it detracts from their movement and its ability to operate. In my country, social ostracization has played a key role at thwarting their propaganda efforts and recruitment events, even reducing their reach in other reactionary circles.