It depends on what vibe I'm getting from them, other people's vibes are strong on me(I think my cancer rising 1st house counts there). If I'm fearing them I would say no in a quiet, soft, vulnerable way, and if it is anyone else and again depending on my feeling in the moment, it will always be a confident no. Which way, if I was to use humour it might come across as patronizing to the other person because that is mostly what it would be. I would probably be thinking f you to myself so that is why I would charm it up and come out with patronizing humour, just that feeling I would have I would let myself be taken over. I moving towards saying no to a selfish person in a constructive, courteous, respectful, mannerly and imaginable way. The bottom line is selfishness is good because everybody is only that, I doubt there are any selfless acts.
mars libra house 4 direct
mars square ascendant