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You can only downvote once your own comments have been upvoted a bit.

Keep in mind though that you should only downvote for abusive comments (which also deserve a flag), gross misinformation, or other things like that. Disagreeing with someone is not a good reason to downvote.

Yup, you need 500+ karma to downvote (and you can't downvote responses to your own post)

Thanks for the info, have an upvote!

You need a certain number of points before you can see the downvote or flag options.