I am a stick in the mud... As I hold others to a moral ground...

I watched a young lady flirt with a man whom she didn't know well, then I told her hey that's your uncle... Then he told me "Hey you suck!!!" I'm like yeah but I was grossed out when I saw her flirting with her uncle! I do this all of the time, I'll see someone who has a boyfriend flirting with another man, and say yeah she has a boyfriend.. Then they get mad at me!! I am sorry for holding these people to my own standards... Should I shut up or stand up for what's right!!! I am stepping on peoples freedoms and free will, and reminding them what is right and what's wrong... I am so sorry for making them mad like I'm some kind of kill joy! But I don't want anybody to get hurt in the long run!!! Am I a stick in the mud, am I wrong to force my opinions and morals upon others?? Sigh they hate me for standing up for what's right. Evil prevails when good people sit back and do nothing, or is it none of my buisness?