ALPA has contacted the Purser 3 different times, through 3 different means (AFAR EPA, her In flight supervisor and people at SOAP) for a "Mediated Conflict Resolution Meeting" with the Capt. She said, "absolutely not...HE had the conflict...not she."
If the CA felt totally exonerated she would welcome the opportunity to a forum that gave her the chance to give her version of events. By deliberately avoiding it casts doubt on her side of the story, would it stand up to examination? I suspect her union are instructing her and they know thin ice when they see it.
There is a fairly thick tome produced by the USAF that deals with crew rest patterns, flight deck lighting and crew meals and eating patterns. This document emphasises the need for crew to maintain their blood sugar levels and thereby their alertness. If this captain did not feel safe to eat his meal then yes, there is a big safety issue as about seven hours or earlier into the flight he should be considering a meal so he had the choice of eating a possibly contaminated meal and falling sick or not eating the meal and losing his required level of alertness and ability to fly and make decisions safely.
This captain chose the extreme option but that doesn't make it or him wrong.