“So just do it” is a glaring one for me.
Simply because it is disregarding someone else’s thought processes and how their mind works. Where simply ‘just do it’ is not as easily and readily accomplished. This kind of advice is always uttered when one person is going on about how they’re tired of something and want to do something else. So this gets mentioned.
It could be a lot of reasons as to why, even if it is down to the obvious reasons. My valid reason a lot of the time is that I just don’t have the energy or will to just magically get myself to do something.
My math teacher, when I said I did not know how to do the home work: “Well, just do more math!”
How do you expect me to do more math, when I do not know how?
On hindsight, he was right… I should have re-done quite a bit of the math courses, properly, so that I would have had the basis to advance. At that moment, he did not have the time to help me, since he knew I had been left too far behind to quickly catch up. It just felt so stupid to teen age me. I ended up dropping out of the higher math courses and just did the basic ones. Ended up with great scores for the basic maths, with a far better mental health. I had been strugling with math for so long.