Can I consider myself from Nepal if im also half Bengali ?

Ok so a few months ago, I went to a Nepali function and I was approached by a elderly man who asked if I was Nepali. I told him I was and stated where I was from and etc. He proceeded to say that I was “ faking “ being Nepali when i’m clearly not. Since then I’ve been rethinking and wondering if I should consider myself full Bengali. Any idea on what to do?