sorry if I don't respond right away. I've been [...] downvoted to -15
That's OK. If we no longer have any way of agreeing on whether propositions are useful, reliable, or true, or agreeing on what it means for propositions to be any of these things, then I don't anticipate the discussion going anywhere from here that's worth my time. We can let it drop here.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.