[jjulius]

>I don't believe I was particularly aggressive.

"You don't know what you're talking about" is aggressive and rude; like you're calling them stupid. "Actually, I don't think that's right", along with some, "Can you clarify?" is not aggressive, and welcomes them into a conversation.

>I called them out. That's how it should work.

There's a way to do that constructively. See above.