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Being "voted to -2" doesn't necessarily mean you were wrong (it often correlates though). People might just think it wasn't relevant in whatever context you posted it in
I often find it hard to tell what makes people think something I write is not helpful (or sometimes also a comment someone else made) and thus appreciate comments that clarify constructively. It can also help to ask for clarification if you're particularly surprised about the votes on a given post
That’s not what happens in practice.