“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.
Maybe a bit of a stretch, but I try my best to interpret things in the best possible way (sometimes to the point of naivety). In a way, I think of it as “choosing to be happy”, in the sense that if someone says or does something that could upset me, I try to look for a way to interpret their actions as something that doesn’t upset me.
Of course, this doesn’t always apply, but I’ve experienced that it makes life a lot better. A lot of unpleasant things can be attributed to mistakes or misunderstandings, which are a lot easier to not get upset about than people being intentionally mean.