Naughton’s Nonsense

I saw a bumper sticker the other day that said something to the effect of that the only good way of learning, thinking, and socializing is to be open-minded. I can’t remember how it was phrased but I do remember thinking what a closed-minded statement. Wouldn’t a truly open-minded person accept both open-minded and closed-minded philosophies as being valid? Just something that struck me as being funny.