To be genuinely outraged about something, you need to actually believe in something. Without principles, outrage is just tactical anger, or bullying in plainer language. Principles, values and codes, are universal. That is if you are angry about a dog being mistreated by riding on top of a car, then you should at least be equally angry at dogs being eaten.
If a man shooting another man after a confrontation and not being charged for it angers you, then it should anger you regardless of the color of his skin. For that matter, if racism or sexism offends you, then it should offend you regardless of whether it is directed at a woman or a black man who is a liberal or a conservative.