[hyperdimension]

Sources certainly can add some factual, concrete evidence to someone's argument to ask for a source or two.

That being said, I think some just near-reflexively reply 'Source? Source?' as a sort of low-effort 'rebuttal' by implying it's just, like, your opinion, man when they haven't necessarily come up with a well-thought-out argument.

I won't disagree that well-sourced arguments add much to a discussion, especially if you're not well-informed about the topic at hand.

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But don't worry about the down-votes. It happens, who can know for sure why, they don't really matter, and if you're earnest in your comments, you'll almost always going to end up in the black. :)