It is in fact a TSA rule that passengers are only to use the lavatory in the class of service they are seated in. And in fact, unless something has changed this is for all flights, international or domestic.
I'm not going to defend the passenger or the flight attendant either way, but one question I have is, the first time he was told he had to use the coach can, why did he not go to the flight attendants doing meal service and let them know he desperately needed to go. From what I've read I don't think the cart was too far from his seat. The flight attendants would have simply pulled the cart back past his row, so he could then have access to the lav.
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