Iago, Brabantio and Roderigo. Nobody else seems to care. And probably Brabantio is the most intolerant--he will have Othello over to supper but he wouldn't want him to marry his daughter. Roderigo wouldn't care except that they are rivals for Desdemona and Roderigo will throw any dirt that might possibly stick at Othello. Iago's position is mysterious, but whatever his motive for disliking Othello (and who knows, race might be a part of that), he is sure prepared to make an issue of Othello's race around the racist Brabantio.