Upvoted mostly for the self-honesty. I wonder sometimes if I'm more 'forgiving' of bad arguments for positions I already agree with. (Answer: probably, but unless I know how much it'll be hard to correct for.)

I do find it pretty unpleasant when people hold my opinion for reasons that are... lacking, but I think this may be more of an allergy to cliché than to bad logic. I get the same sensation when I hear people intone individualist or liberal catch-phrases in full sincerity, regardless of how much I might agree with the sentiment.