Hi Jeff, I think I know WHAT HAPPENED:
during your morning speech (see Video below exactly at minute 22:57)
you spoke about VIETNAM...
(N.B. go to minute 22:57)
I think Kiyosaki was there listening to your speech and took what you said as personal. Then, when you met him, he (un)consciously remember what you said and took a chance to assault you.
What do you think, could this be the reason?