I fell out with an entire roomful of peole once when I told someone what I thought of their theory about bo-diddly's rhythm, which they supposed to be 7/4 or something, then told the same person what I thought of their instrument playing, and then various others who thought I must secretly admire this particular other because I'd been so forthright. The whole evening was a disaster, and I havent been back, but I'd stick to the principle of saying what you think, irrespective of consequences, if you think someone is talking crap!