> you claim that it isn't true makes no sense either since this isn't a claim about a fact that can be true or false

actually, it makes total sense, because your factual claim was that, for a nonzero number, "you've achieved 0", which is obviously wrong. It's simple logic, friend.

maybe try tying your post back to reality, where the effect isn't actually zero? Fill in the analogy, since it's clear we can reduce our microplastic exposure a non-zero amount (your personal opinion that it's not enough for you is what is irrelevant here)