Been thinking on this. You say her family is like this & this is the behavior she grew up immersed in maybe not even knowing what is was she was learning to behave like. Sounds like it was her NORMAL.

That doesn't make it ok or give her an excuse to continue living that way. It does mean that she needs to learn that behavior is NOT ok or acceptable & if she is willing to change you both need to work together on changing it....

If she is willing to hear how hurtful her behavior is & is willing to change it could be as simple as reminding her every time she presents that kind of behavior.

When I first got married my new H pulled this put down sarcasm on me & it really annoyed me especially when I didn't like throwing it back in his face which was how I first started handling it. I had enough self-confidence it didn't hurt me, but it was just horrible putting people down....lol, especially someone like me who was more than his equal....but beside that, I told him that if he didn't stop it I was not going to stay married to him. It took over a year of continually reminding him EVERY TIME he did it but that behavior was finally broken for the most part.

He was willing for me to handle it that way & willing to change.

Otherwise your wife may need therapy to work om changing this behavior depending on your marriage dynamics. If she is unwilling to change then I would definitely think twice about staying in a marriage like that as with more practice she will only end up as bad as her dad.