Three semesters maybe isn't enough time to have observed enough to know all that much about teaching, but surely it's long enough to be able to sense when students are reacting to the professor in ways that seem less than desirable. Is this how you act with your other professors? sounds too much like a rhetorical question, when really they might be wondering, waiting for some sort of answer.
But the trouble is, even if the problem is the students, it is still because of professor. There is something about their demeanor, apparently, that suggests that it is okay to complain to or confide in them, to be restless, childish, to be, well, whiney.
Your plan of wearing your glasses to class to appear more authoritarian now seems a little like someone slapping on Groucho Marx glasses to seem more serious. You still aren't exactly intimidating.
Not that intimidation is really the desired effect. But also, you most likely don't like having this problem simply because of what it entails: a whole new kind of self-consciousness. A nagging feeling of needing to change some fundamental part of your personality, and wondering, well really, how you could ever actually accomplish that.
I guess being a human entails that all the same.