No, it's not, it's among the same vein as "huh?" - it's a thinly-veiled attempt to paint opposing view points as so stupid that you literally cannot comprehend them.

But you can comprehend them, we all can. So it's just abrasive and annoying. You can express a conversational tone without being an asshole. You don't need to act like your conversational opponents are super far out there or crazy or whatever.