A: Mods usually don't specify which mod a tip comes from, meaning it can be hard to actually "just don't use that mod" as suggested (exceptions exist though, and it has gotten better recently).
B: This is not a policing action, this is not a threat, it is purely the opinion of one person who'd like it if people, at the very least, specify if they add content which is of a very different tone to the rest of the game experience. Not a particularly tall order (not to mention it's not an order, but rather something they'd find nice), and definitely not a "tyranny of the offended".
C: Of course people can say things about a mods tone, just like the creators have every right to disregard said things. The argument that "they've put in work, you haven't, shut up" is utterly ridicilous... however, the opposite is also true: that a mod creator is forced to listen to this critique is equally ridicilous.