Dilettante — noun — a person who cultivates an area of interest, such as the arts, without real commitment or knowledge.
He goes to the opera, attends recitals, collects old recordings, has an opinion about everything, and tells everyone within earshot that his great-grandmother was a great singer; but of course, you haven't heard of her because she didn't record—her Victorian husband thinking it rather déclassé. And then there is his own voice, which he takes out for a spin from time to time, but singing teachers being such frauds, well.....one can't be too careful, can one?
Avoid him (or her) dear singing teacher, as well as the flattery which falls from his lips. He will never amount to anything, arrogance of self-importance keeping him from learning anything despite learned degrees. For all you know, they're made up too, which 5 minutes of fact-checking will reveal.
Don't. Waste. Your. Time.