for Me The Difference Between A Boat And A Yacht Is Determined By The Arrogance Of The Owner.
+100
A good example is my friend Gerry who owns a very large power boat, three digits in length. Granite counter tops, hydraulic hide & seek TV, 115HP dinghy with crane, three fully stocked bars, wine cellar, 7 state rooms each with their own independent heat/AC systems, a full work shop & two 16 cylinder Cats that burn more fuel in a day than you and I can burn in our cars in a full year. He paid over 1 million just for his slip for his "boat".
Yes he refers to it as a BOAT! Why? Because despite being insanely wealthy he is the most humble, non-arrogant person you'd ever meet. He wears a Timex not a Rolex... Oh and the dinghy is called the dinghy not a "tender" and he has no full time paid captain. He "navigates" the vessel himself.. He does not suffer from male MIC (male inferiority complex) thus does not feel the need to refer to his boat as a yacht....

I own a sailboat, it is not a yacht.