Warren Siegel, a physicist at SUNY Stony Brook, has written “Are you a quack?” (he must have met a few). Philosophers can’t be quite so abrupt. We’re not usually in a position to say that our theories have been well-confirmed by experiment, for example. (Intuitions are not experiments.)
I once had a man come to my office at Hopkins. We chatted for a while. As he left, he gave me a little blue book entitled I am a Visitor from the Universe with a Message for Your Planet. Who am I to say what he was? I haven’t even read the book yet.