Do you have to have reason for not wanting to do something or is not wanting to do something an actual reason?

You always have to have a reason for not wanting to do something. Sometimes after telling someone this they are stubborn because they just want to say "they don't want to" whenever they are asked to do something instead of giving an actual reason. Many arguments arise like this and the person who is asking for the actual reason that the person doesn't want to do whatever they are being asked to do is right and should easily win the argument if the other person decides not to be so stubborn.