Sadly, especially in my family, I find that my older Filipino family members are prejudiced against black people or other non-white or Filipino people.  I don't know the logic behind it.  Maybe it was the way they were brought up, a lack of understanding and tolerance.  Don't despair.  Keep in mind that it isn't you that is the problem.  It's their ignorance that causes you to get that vibe from them.  Nothing you can do about it.  It won't change their minds.