Updated 10/19/2018 -- Regards for all the responses. Much appreciated. To address the point of fact that one cannot "prove" anything about reality:
Yes, I agree. This is the reason I now set my goals when engaging in this sort of heady discourse.
My first goal is to lead the subject through a series of agreements on basic reality, before we broach the issues of real science vs. pseudoscience.
Then, if the subject denies basic accepted scientific facts of life I choose to stop the conversation. For me personally, it is a waste of time/energy. They essentially do not qualify.
Mr. Pink practices a lifestyle of New Age religion/belief. He buys books about new age healing, reincarnation, magic powers, holy god men, etc. Although Mr. Pink doesn't outwardly proclaim his beliefs, he passively makes them known to anyone in his life and frequently drops false 'wisdom' (unsubstantiated claims embedded in cliches) peppered into his conversations.
Mr. Black denies all claims that cannot be proved by evidence.
Mr. Black then confronts Mr. Pink one day at lunch, claiming that all new age magic power b.s. is in-fact, nonsense. Mr. Black claims to know "real" reality and not Mr. Pink's "belief system dependent" reality and attempts to share knowledge with Mr. Pink.
Upon attempting to share this knowledge, Mr. Pink eyes glaze over and he clearly is not listening (evident by his body language and facial expression)... After Mr. Black explains the foundations of knowledge (empirical knowledge) Mr. Pink responds with a rather arrogant tone, and says "Why does it matter? Why are you so [obsessed, fixated, fascinated] with these people's beliefs?"
Mr. Black is perplexed, as he thought all human beings have an innate desire to know the truth. Even when Mr. Black presented documents, books, videos and other media to help Mr. Pink understand what knowledge is and how it can be tested, Mr. Pink flippantly ignores the information and goes back to his lifestyle of New Age belief-dependent-reality lifestyle.
What is this approach? How does one even deal with someone such as Mr. Pink?