the least negative reason is not very clear. do you mean "it's the least negative sentiment against the comment" or the least negative kind of comment? or do you mean "it is the least bad/wrong reason" or the best reason as in: it's better to use downvotes for disagreement than for other reasons (others should then be flagged?)?

i read it as the former, and hence upvoted your comment because i agree, but the downvotes of your comment suggest that others are reading the latter which feels wrong to me. that is of course if they actually agree with me.