Anxiety: one of the sources of mental evil. It's pretty unrelenting when homework and work itself has piled on more shenanigans than you can handle. Eventually, it calms down and you calm down, which is great, but then there are those that are still worrying about everything else and cannot for the life of them, calm down. Usually, those are individuals with anxiety (unless they're naturally like that, of course), and when they're talking to you about their issues, there are just some things you do not tell them.

"You don't have anxiety. It's all in your head"

Yes, it is all in the head. Yes, everyone has some form of anxiety. But no, you do not know what the hell is going on in there. Quite frankly, to tell someone that after they've clearly told you that they have anxiety is a hard slap in the face. You leave that person feeling a little, if not a lot betrayed. Why? They trusted you with some little fact about them and you just disregarded it; you took that bowl of cheerios but not only pissed in it but shat on them at the same time.

"Oh, stop it. No, you don't"

This sort of blatant comment is in itself, disregarding. Although it's meant to be all in good fun and less direct, it sends a completely different message to a person with anxiety. Similar to the you don't have anxiety saying, it leaves a feeling of betrayal a lot worse than being told that "it's all in your head."

"Everyone has anxiety. Yours isn't any different."

Uh, hellloo... do you deal with stress the same as everyone else? I'm pretty sure you don't. Anxiety hits everyone differently, just like stress and depression does. Everyone does not have the same coping mechanisms or the same mental resilience

"You'll be fine. You worry too much"

Of course people with anxiety are going to worry too much. That's practically what anxiety is and there is no off button when it comes down to it.