Cursing you and insulting your mother

So I started with this:

The only thing that can make a program user-unfriendly is if it's cursing you and insulting your mother. Otherwise, it's merely unintuitive, and that's a factor driven by unfamiliarity with the paradigm.

Too long...I need it down to 140 characters. Try this:

A program isn't user-unfriendly unless it's cursing you and insulting your mother. Otherwise, it's merely unintuitive, and that's a factor driven by unfamiliarity with the paradigm.

Still too long. How about this?

A program isn't user-unfriendly unless it's cursing you and insulting your mother. Otherwise, you're just not familiar with its paradigms.

Still too long. One more try...

A program isn't user-unfriendly unless it's cursing you and insulting your mother. Otherwise, you just don't know how to use it right.

Ok, that's short enough, but it's kinda clunky, and could be more succinct.

Unless it's cursing you and insulting your mother, you simply don't know how to use it.

Not what I was trying to get across...