Nobody wins arguments on the internet, so let's agree to be unable to agree on the definitions of terms about which to disagree.
People win arguments on the web all the time. What's rare (and different) is at argument that persuades some of the participants.
Are you certain that you don't want to argue that "just", the word on which your argument and position depends, actually has a useful and good meaning?
Hmm. No one chooses their parents. Should rich kids be taxed like poor kids?
> Would you agree that taxes should be just?
I'll agree that "just" has no agreed-on definition and is used as a way to imply that the other person is bad. As such, I find it a useful signalling device in a discussion.