You don't have to care; it isn't a commandment; I just know that I personally care about myself and those close to me.
Personal disgust comes from physiological, psychological, evolutionary, and socio-cultural factors, which amount to moral beliefs, not the existence of moral facts; moral entities and facts, that is, actual morality, are something over and above empathy.
As I said, care is a feeling, but if I felt that feeling for every atrocity that happened in the world every second of every day, I would not be able to function; if you made me have a feeling, for others I would never know, interact with, or be able to help, then it is a duty, I have no connection to these people, I am sorry that I don't know them.
No one said you couldn't be rude, I merely found it ironic that you kept charging me with issues of 'rudeness'. I didn't say immoral; it is amoral, simply because I am not supporting immoral things, I am merely arguing that morality is always someone's morality.