Firstly, there is no debating, go on their website, or youtube etc and you will see them denying that they are racist. Like Goebbels said, if you're going to tell a lie make it a big lie.
Secondly, I'm not telling Napoleon a.k.a. butchersapron, Durrito, etc how they should oppose fascism, they are telling the antifascist what to do ie "stop opposing fascism". I am just defending how I see fit to oppose fascism.
Now, I don't accept your logic. The Labour party, Socialist workers party, the woman next door, the vicar down the street, all disagree how they would address crime, housing, immigration, health and multiculturalism. Socialist worker cannot unite all those people who are opposed to fascism, into opposing capitalism. But they are indeed concerned about fascism, and want to do something about it. Being concerned about fascism is a progressive concern. In my opinion it is a Socialist duty to take up the progressive concerns of the working class in the here and now, is that not true?
Taking up that concern, in a single issue campaign anti-fascism, does nothing at all to stop the Labour party, Socialist workers party, the woman next door, the vicar down the street, all addressing crime, housing, immigration, health and multiculturalism in other campaigns from their own political perspectives, does it?