I don't want the be responsible is a reasonable alternative to "that's not possible" , "I don't want" is not something a person can argue with. It's like arguing if someone likes the color blue.
JADEing it not a opening for people to call" rude". Pushy people making completely unreasonable demands just defeated the most reasonable justifications " I cant take notes because I may not be there" , "ohhh I'm sure you will be there , you paid a lot for this class I'm sure you wont miss. I get a friend to drive you on a snow day." In a healthy relationship a justified "no" is often a kindness and good communication.
If someone called you rude for saying " I can not because I wont be there" they would be wrong.
It's funny because I completely agree with you, MMM! My Bff and I use a variation such as , "Oh I don't really want to do that," or "I don't think I'd like to do that," which we both instantly respect and push no further.
What is funny is that one person will argue with my choice of the color blue. My DH.
When he starts asking 'why don't you want to ____', depending on what it is, I simply say, "There is no 'why'. It's like asking 'why is that your favorite color?' 'It just is!'
Then I add, "Honey, you're looking for reasons to shoot down. Please stop." Kiss kiss hug hug.
To anyone else that I've said, "I don't want to do that," they've never pushed back at me or tried to argue me around it. I hope I haven't offended anyone but I try to keep my tone firm but light.
ETA: Posted without actually typing anything!