With that one change, Lucas finally went too far. However, he still doesn't realize it. Instead of admitting his mistake, he chose instead to lie about it (saying it was his original idea in 1977) and then went so far as to make up cartoon t-shirts about it. Then he somehow thinks it would actually be funny to wear one around the actor whose character he ruined. He's that out of touch.
With that one change, Lucas finally went too far. However, he still doesn't realize it. Instead of admitting his mistake, he chose instead to lie about it (saying it was his original idea in 1977) and then went so far as to make up cartoon t-shirts about it. Then he somehow thinks it would actually be funny to wear one around the actor whose character he ruined. He's that out of touch.