One that comes to mind for me: “Whatever doesn’t kill you makes you stronger” is not always true. Maybe even only half the time! Are there any phrases you tend to hear and shake your head at?
“Life isn’t fair” always bothered me, even as a kid, because it was used against me to dismiss unjust actions.
Saying something isn’t fair is basically saying it’s not right, it’s not just.
Trying to claim the injustice against me is moot or unimportant just because there’s lots of injustice in the world, seems bonkers to me.