Being the “cool” teacher isn’t all it’s cracked up to be. On the one hand, kids like you and potentially admire you, and you don’t have to worry about being given tough treatment by anyone, at least the ones that like you. But on the other hand, you’re left without meaningful connections. You are forced to always be in nice mode, even when someone makes a mistake. It’s difficult to call someone out after they’ve gained your trust and believe in you as an adult. I know that’s a normal and expected understanding for teachers to have, but it’s a downside of being the “cool” teacher, for sure.
It is important to remember that your job isn’t to get them to like you, contrary to what people may say. Even though getting them to like you is a big bonus, and goes a long way to having a constructive, collaborative classroom environment, it’s not everything. It’s never everything. Their education comes first, and so too does your teaching. They won’t receive a quality education if you focus so much of your efforts on being “liked.” You need to separate that distinction in your head in order to be a good teacher, as it’s something I’ve heard from a lot of my colleagues as well. “Being liked is nice, but seeing their test scores go up is a bit nicer,” one of them said to be once. I know it’s a cynical perspective to have on things, especially the test scores comment, but there’s a grain of truth to it also.
Effective teaching does involve a degree of likability, though. You can’t be an omnipotent tyrant standing at the lectern, endlessly insulting students. Even if you have an unruly class, even if you’re still “teaching” them, that’s not effective teaching. There’s a balance between being liked and being likable.