Anyone who belittles you for interacting professionally with them is really just exposing themselves as an asshole, and their behavior is not reflective of you

Anyone who belittles you for interacting professionally with them is really just exposing themselves as an asshole, and their behavior is not reflective of you or your worth as a person. That said, what options do you have to train and do something else? Do the minimum to keep your job and be professional, but spend most of your time and energy outside of your job learning and training to do something else. You can use asshole behavior towards you as motivation to burn the midnight oil and get shit done. In general, any workplace that allows their employees to be abused by clients is not a place anyone should work. You have options even as someone in Nepal, look for international organizations or non-profits or NGOs. Good luck.