Yes, pinching someone and continuing to do so after they have told you to stop is considered a form of physical abuse. Abuse is defined as any behavior that is used to gain and maintain power and control over another person. It can manifest in various ways, including physical, emotional, verbal, or sexual abuse.
In your situation, if someone pinched you and you repeatedly asked them to stop, their actions would be considered abusive because they are disregarding your boundaries and violating your personal space. It is essential to recognize that fighting back in self-defense does not change the fact that the initial act was abusive.
Abuse of any kind is not acceptable or justified under any circumstances. If you are experiencing abuse or have experienced it in the past, it is crucial to seek help and support from trusted friends, family members, or professionals, such as counselors or support organizations. Remember that you have the right to be treated with respect and dignity, and there are resources available to help you address and cope with such situations.