It's obviously not a direct question (there are people defending him in this thread, so of course he "believes" that), and as a rhetorical one it implies that he is lying. That's not a civil debate tactic—there's a reason why parliamentary systems expel people for using it.

Everyone needs to err in favor of respect when addressing someone on the other side of an argument, especially when one's passions are agitated, because the default is to forget all that.