William W. Bartley on Popper:
Sir Karl Popper is not really a participant in the contemporary professional philosophical dialogue; quite the contrary, he has ruined that dialogue. If he is on the right track, then the majority of professional philosophers the world over have wasted or are wasting their intellectual careers. The gulf between Popper's way of doing philosophy and that of the bulk of contemporary professional philosophers is as great as that between astronomy and astrology. [emphasis added]
I agree with this comment. Note it doesn't apply to Ayn Rand, who is also an outcast from the majority of professional philosophers.
The quote wording is not exact. I haven't checked the original document. Sources:
Bartley, W. W. (September–December 1976), "III: Biology - evolutionary epistemology", Philosophia, 6 (3–4): 463–494