I tend to have a bit of a loose tongue IRL and sometimes let the F word fly (not around the kids though) but personally I hate the C word. I just find it common, and I don't mean commonly used, but low brow or bogan. I think it's a revolting word.
It's also context for me... if someone is a status said F I hate when my washing gets wet, then I'd think meh. But if it was like That f'ing C, I'm going to bash her... nope don't like that stuff.