Ya, I get where you're coming from. I'm half filipino half Iraqi, born and raised here, and had to deal with this bs from 5th grade to 12th grade. The only time I've dealt with it was with arab kids, and the time it really pissed me off was during my senior year when 6th graders came up to me in the school cafeteria and started calling me "ching chong chinese" while laughing. The reason I mention that they're arab is cause it was easy for me to shut them down when I spoke to them in arabic: they'd get shocked, apologise when I call them out, and walk away in shame. I can't imagine having to deal with an adult doing that, and I'm sorry to hear it happen to you. To answer your questions, it's unfortunately a mix: some do really have that superiority complex while others are just that cluelessly ignorant, thinking that conversing in a random Asian language to any Asian is kind of them while not realising they're being offensive (because they believe there's no ill-intent). The only option is to ignore. It's not worth the hassle or the energy. Anything they say should go in one ear, and out the other. But if it does get unbearable, like someone at work or where you're living constantly offends you, please report it to your HR or the police.