Excuse, mean you already agree to take part in something, but change your mind and look for Excuse to get out of it. As for me I’m straight forward, in the first place I would say no, or its not for me or I’m not interested. Then I wouldn’t need a excuse.
Not necessarily the case always David let me give you an example like what if you are standing outside somewhere and someone comes up to you and starts talking but you’re really not interested in talking to them. So, you are telling me that you just simply be rude and say I don’t want to talk to you or something like that? or would you think of something nice to say to move away from the situation? Tell me I’m waiting….you don’t strike me as being a cruel person.