If I REALLY disliked any term that my Dom gave me I would say so after the scene and when I could say it in a way that was not charged with the negative emotion that was attached to the name - no point in ruining a perfectly wonderful scene for one phrase that has no power other than what I choose to give it...
I personally love 'good girl' when he says it to me inside and outside of the b'room....but would recoil if most other people used this term to describe or address me as it does have some obvious patronising connotations...but it does all depend on the tone. But I may not be the best judge...in Australia, sometimes the most horrible epithets are used to refer to each other ("How's it going ya old bat / cunt / bastard?!" are some of the cheery greetings that can be heard in any normal pub on a Friday night as old friends greet each other.....we all know that these names show us that you are loved and most of all accepted (we delight in teasing each other and giving the worst most degrading nicknames) but it ALL depends on the tone and delivery...if someone other than a close friend called us that, well....its WAR!
But if you don't like it, say so...end of. Gently provide him with an alternative name he can use that does do the right things to you (after all its meant as a reward) instead of making you feel uncomfortable....he wants to know your triggers (good and bad), and communication is the only way to do that....as I can see from most posts here, 95% of the subs here love the term 'good girl' when delivered by their Dom, so he may have no reason to believe this could cause you any conflict based on prior experience with other subs...
Life's too short to feel bad about 2 simple words...you can change it
xxx
PS but be prepared for him to bring it out when you do something wrong!!! hehehe