Am I overreacting?

Question

I am having a hard time figuring out if I am overreacting about how my husband interacts with one of his coworkers. He does nails (yes he's white and he's attractive) so he works with all women, except the owner is male. All the other women are Asian and quiet and keep to themselves. About her: She started working there about a month ago and never did nails previously and she has needed a lot of help figuring out how to do things. She is only 20-21, literally half his age. She is white (non-Asian) and somewhat pretty, very thin. Lots of tattoos. (My husband is very attracted to women with lots of tattoos, he has a lot of tattoos also). She is very loud and annoying. She is constantly only asking my husband for help to learn how to do things. Before she started working there the shop owners wife always did her nails but now she makes appointments with my husband to have him do them, every week on her days off. 
My issue: my husband is constantly teasing her, like that is most of their communication. I don't know if I would call it flirting but I told my husband it bothered me and he said he would tone it down. He does but then a few days later he starts doing it again, constant back and forth giving each other a hard time. I talk to him again about it and I tell him it I feel disrespected. He says he isn't doing anything wrong and shouldn't have to feel like he is doing something wrong and shouldn't have to walk on eggshells around her. That he teases a lot of people (except for everyone else he works with) and many of his customers he has a similar teasing relationship. He says he's always been this way and isn't going to change for me. He feels that I am acting silly and even if this girl was interested in him, it wouldn't matter to him because he is just having fun at work. I told him she is immature and probably perceives this type of communication as flirting.  He said he doesn't care because he isn't doing anything wrong. 
I am hurt but he said he isn't going to change. Should this even bother me? I guess the hardest thing for me is that even though he knows that he is doing something that bothers me he refuses to act any differently around her and if the roles were reversed I would be embarrassed he would even have to talk to me about something like this, let alone refuse to make my husband comfortable.

Also, another younger Asian girl started about the same time and just graduated and is in the same boat learning how to do everything, however, my husband doesn't help her and says she is too quiet and refuses help.

Answer

I would constantly hear it when we were on the phone. 
I guess it's not that he does it at all but now it's the fact that he doesn't care if it bothers me and that my feelings are disregarded. 
There are other issues in our relationship specifically regarding how he does nothing for me to make me feel special, I.e., no presents, ever not even my birthday. He always twists the way I feel about something so it makes me the bad guy then I'm the one always needing to work on something. I honestly feel degraded, like I'm just another person in his life and it wouldn't bother him at all if I weren't around anymore. 
Thanks for your response , sorry for the long rant....

Answer

How do you know that he teases her at work?

If she hasn't been inappropriate then I wouldn't let it bother me unless the teasing is sexual in suture then it's disrespectful.

At work we have a lot of teasing with each other, high stress social workers, but it would never be considered flirting ever.

Am I overreacting?

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