I think what is more interesting to observe is that he felt comfortable detailing his behaviour in a written/recorded format to a fellow crew member within the same time frame as the trip/return leg. To me; that says a lot more about the company culture surrounding such behaviour.
If this was an outlier in terms of actions/bahviour then wouldn't they know well enough to keep it to themselves and not broadcast it in a format that can be recorded? The contents of the texts appear to me as if it is the bragging report of some regular antics down-route.
*I'm leaving in the spelling error because it made me laugh
