“Fallacy” works. These are also adages, clichés, platitudes and folk wisdom, but neither really means “falsehood” per se. However, many of them just rationalize whatever: the money one is factually incorrect and exemplifies “sour grapes”, silver linings is not a bad idea but also not necessarily true, any number of things will not kill you but make you wish they had, etc.
A lot more of a realistic take than this place fixing every issue with Reddit, to be honest.