I posted this question about whether a given main site question should be reopened because there was a debate happening on the main site and I wanted to take it off there and onto meta, which is the right place to decide these things. I voted to close the original question, and anyone who read the original question should have been clear that I was not in favour of reopening it.
I found that my meta question was getting downvotes, which surprised me, and I was told that downvoting a question is a normal way of indicating disagreement with the question. I'm not sure why that is the case. I would expect a downvote only if the question was a bad one. If someone thought the answer should be 'no', they could write an answer saying that, or upvote the appropriate answer if there is one.
Should this convention be kept?