Rightly or wrongly I have similar feelings for fishing boats as I do for taxis.
Internationally most taxi drivers seem to believe they should have exclusive rights to the highways and any other users are just amateurs blocking their way.
The crews of most fishing boats seem to hold similar views of other users of the seas, especially yachtsmen.

Over the years and in various European waters I have had to take avoiding action with fishing vessels who were clearly not fishing and equally clearly were not the stand on vessel. On one occasion in Cardigan Bay the reason became clear as the stern of the boat came into view. The wheel house was empty and entire crew were gutting fish on the aft deck. No one had seen us!

They overtake yachts at uncomfortably close quarters. Something you do not see them do to supertankers or other larger vessels.

In my experience British fishing boats do tend to respect the regulations when it comes to showing lights. Last year I was horrified by the large majority of Spanish fishing boats showing either the wrong lights or no lights.

As for their use of VHF, well that just beggars belief.

Their misdemeanors not only affect yotties, but other fisherman too.
As a teenager I once spent a miserable day searching rocky coves on the Scottish west coast for survivors/bodies of a collision between two fishing boats. The crew of the offending boat were drunk and below deck at the time of the collision. So drunk that it was only later when their own boat began to sink that they realised something was wrong.

Of course there are exceptions, and I am sure there are many who behave in a professional manner at sea.