“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.
It’s those times where I shorten my response to something like “thanks I’ll keep that in mind” or “I appreciate you trying to help” and then brush it off/not follow that advice, because it usually comes from people who at least sort of care but have no idea what to say or how to fix the situation.
If someone genuinely wants to invest in helping your situation they’ll ask and be open. For me most of the time my answer is “you being there is enough” and when I tell them I don’t expect them to have answers to my problems they relax too.
If it’s randos trying to be argumentative or dismissive then they can go sit naked on a cactus. /tangent
TL;DR: You’re right, but it’s an onslaught and you deserve peace of mind. You aren’t obligated to defend yourself to them.