A comment from Spencer’s sewer:

I don’t believe Mr Spencer is anti-Muslim, just anti-Islam, because he attacks Westerners who support Islam as much, if not more than, native born Muslims.

That passes for an explanation of why being a bigot is not being a bigot in the anti-muslim circles. It’s similar to “I’m not anti-Semitic, I’m anti-Zionist,” except it’s more like “I’m not anti-Jew, I’m anti-Jewish.”