[fortysixdegrees]

I found that more than a little odd. Sailors are universally out to help other seafarers and hope for help themselves when they need it. This was the guys first blue water trip, I guess he wasnt a true sailor yet, and hadn't lived life abord for long enough to adopt the culture.

[jjav]

You are correct in that the seafaring culture is to always render aid.

Additionally it is also the law and international convention.

https://www.bullivant.com/rescue-at-sea/

“Every master is bound, so far as he can do so without serious danger to his vessel and persons thereon, to render assistance to any person in danger of being lost at sea.”

[DocTomoe]

Sailors are. They intimately know the sea and her dangers, they know looming death and despair during many months of being subjects to powers immeasurably stronger than any human can ever imagine.

I would argue that two blokes on a sailboat doing fun rides in the Caribbean are hardly sailors. I guess when they talked to other 'sailors' who were 'agast', it was the Jonas Grumby/Gilligan type.