So, thinking about it, why did he act that way? Was he trying to tell you (and everyone else) some message? That any appointment was, uh, interrupting or intruding on his valuable time?
I just think it was immaturity. He has some very fine qualities yet in some ways is still childlike, a combination that seems to be common to a lot of liberal types, oscillating between being Mr. Dependable and Mr. Flakey.