I'm going to side with 100smarble who said this electrician may have simply had poor communication or customer service skills. Having said that, if he sees something that is wrong, and it is completely unrelated to the work he has been asked to do, then I would agree he
has a duty to report, but not repair, it. That report should be in writing, for his protection.
If someone says they are ABYC certified, you should verify this, you can do so on ABYCs website,
www.abycinc.org I have encountered several imposters in the past few years, those who either have no certification, or they have a certification, but not the one they claim to have.
In the inspections I carry out, I'm routinely confronted by brokers and sellers questioning my findings, often saying, "was that required when the boat was built?", to which I respond, "who cares, if it can electrocute someone, or cause the vessel to catch fire or sink, it needs to be fixed. If there are DC cables that lack over current protection or 120 VAC outlets on weather decks and in heads and galleys and engine rooms without GFCI protection, that's a credible risk. If the seacocks are PVC swimming pools valves, that could cause a vessel to flood and sink" These all represent violations of ABYC standards, and while the standards are voluntary, the marine industry gets better at embracing these with each passing year, and thank goodness they do, it has raised the bar for reliability and safety, and as others have pointed out, it's an unbiased third party standard that can be objectively applied without relying on someone's intuition or opinion.
Somewhat related is vessel owners asking electricians and other professionals to carry out a repair in a manner that the pro knows to be non-compliant. Many feel pressured to do this, because if they don't they will lose the job, we've all been there, or the owner says he or she will sign a waiver. My advice, never, ever compromise your, or ABYC Standards, simply because you were asked to do so. Knowingly doing this will place you squarely in legal, and moral, jeopardy. Are there cases where the Standards can't be practically met, especially on an older vessel? Yes, but they are the exception, and certainly not in the case of over-current protection, there's always a way to install a fuse or circuit breaker. More on that subject
here
Part of working successfully with the marine industry is understanding how to task them. Back to the OP, given the opportunity I would have asked for a written list of the work he intended to perform that was above the original request. Often that alone will bring clarity to the situation.