It appears your wife lacks the basics of interpersonal relationship. It is not appropriate for anyone to tell jokes at the expense of another, especially when the other does not feel comfortable with the jokes. This shows a gross lack of sensitivity on your wife's part. Besides, she obviously does not understand that by ridiculing you, she is actually disrespecting you. Now that will do more damage to her personality and people's perception of her character through the hurt you feel.
         
In spite of how you feel however, it is still your responsibility to bring her to a place of understanding, no matter how long it takes and how difficult it is to do. Ask God to give you the patience and wisdom to handle the situation.

Have a heart-to-heart talk with her, taking her through the scriptures. Teach her to speak wholesome words and to respect people's feelings when she talks. Explain to her that otherwise her attitude will mar her reputation, which will in turn impinge on your marriage.
You may also consider going for counselling.