Have you faced such situation when your parents didn't like your boyfriend or girlfriend? I think that this is a rather widespread situation. So I have several ideas what you can do in such a difficult and unpleasant situation.

First of all, don't lose your temper, they are your family, they care for your best interests, try to imagine yourself in their role, and understand their position.

Ask them calmly why they don't like your boyfriend/girlfriend, listen what they say and just think about it, they may be absolutely right.

If you live in your own apartment and aged enough to make your own decisions just ask your parents to respect your private life. Another situation if you live with your parents, here you should compromise, for example don't spent much time with your boyfriend/girlfriend at home, don't stay out late with him/her.

If you think that your parents are mistaken about your beloved, plan a dinner with your family and your loved one. Don't forget to ask