Counterpoint: Perhaps “Don’t buy from evil” is just a catchy way to share a sentiment and you’re taking it too literally/to an unintended extreme to be riled up as hard as you are about it? I see no intent from those comments in line with “fuck you if you give Bezos money” as you imply.
For example: Sonic’s “GOTTA GO FAST,” but in reality, he IS capable of standing around. “Gotta go fast” doesn’t mean his circulatory system shuts down if he doesn’t, it’s just a short catchy way to share an aspect of himself. In that vein, nobody’s kicking your door down if you get the specialized thing you need from Amazon, just saying that it can be beneficial to shop in other ways when possible.