Why do people who pride themselves on being non politically correct only do it across the internet?

In real life I'm not PC and it has gotten me into a lot of "trouble" only because people are insecure and overly sensitive. It's not about being cruel it's just I'm not going to censor myself and I don't deal well with weaklings who get hurt over every little thing. The people who matter the most to me(friends and family) accept me for who I am and that's all that matters.