You are in a wrong place, I guess. Or maybe you walk with wrong friends.
.This story is absurd. Perhaps you have to relocate or change the kind people you move with, because we are also living abroad have been to many places without such bad treatment. Everywhere we go, they respect us. But some bad Nigerians are abroad and take joy in associating with wrong people, breaking laws, following gangs and using drugs and all that; if they know you belong to such group or one of your friends are in it, be sure, they will maltreat you. So, change your friends, or change your location or reorganize yourself.