Where I am from, it's mannerly to treat people well and with respect regardless of their skills or character. Even the people who thought very little of me because I'm a woman never stooped so low as to mistreat me. You can hold disagreeable opinions without being disrespectful.
However, you have already made it perfectly clear to me that you have very negative opinions of me and my culture and I doubt that I shall change your mind. By that same token, you don't have any authority to tell me how I ought to feel.