Is Iago a heroic character?

I was watching the movie Dismissed and the main character, Lucas receives a B+ on his essay. Mr. Butler, his teacher tells him why he gave him a B+ instead of an A.

Here's the dialogue:

Butler: Your thesis that Iago is a heroic character is just a little off-base.

Lucas: I feel that I supported my argument with textual evidence.

Butler: Like, this quote from the end of the first act [Act I, scene 3], “Hell and night / must bring this monstrous birth to the world’s light.” Now you say this is about Iago exposing Othello as a monster.

Lucas: That’s right.

Butler: No, it’s not right. The monstrous birth he’s talking about is his own evil plan. See, he knows he’s doing bad. He just doesn’t care.

Lucas: Othello was a charlatan. Iago is the only honest character throughout the entirety of the play.

Butler: Actually, “honest Iago” is used as dramatic irony because we know that he lies.

Lucas: Not to himself. Never to himself. He knows who he is. It’s everyone around him who doubts and questions themselves. They’re weak. Iago is the only strong character who is true to himself. What’s more heroic than that?

What does everyone think? Is Iago a heroic character or not?

I think Mr. Butler should have respected Lucas' interpretation and give him an A.