Only about 1% of the world stutters. We can't expect awareness to be terribly high, especially when it's not present until someone speaks (and actually stutters during). "Stuttering" has a colloquial sense and a pathological sense. People invoking the former does not invalidate the latter - and again, we shouldn't expect any particular attention being paid to such a distinction, given the distribution of stutter throughout the world. So, it's true that all people can stutter from time to time. It's also true that not all people are stutterers. But you're right that it'd be nice if more people knew more about stutter in general. However, we're going to have to create that awareness ourselves. Also, stutter research hasn't reached a consensus, so it's hard to present anything completely solid (which usually helps with these things). All in all, don't waste your energy on getting angry. It doesn't lead anywhere. Focus on the more positive effort of redescription instead. And definitely dismiss the commonplace advice that's sedimented in our culture for some silly reason (perhaps because it does help some people who experience a stutter in the colloquial sense).