Bro - when it comes to theology, and someone is jacking around like that, sometimes you have no choice but toe give them the right hand of fellowship with some force behind it.
Rebukes are ok as long as they're given in love. How do you rebuke in love and not sin? The only human that could (can) is the God-man - Christ. Should that keep us from rebuking when it's needed? No - but it should keep us humble, which I think you're experiencing right now.