Why do people become disinterested, lie-and try to change topic when i talk to them about investments?

So i made some new friends in school. he's 28 and the other is 63- and we are got along well. the 28yo said he does 'bonds'(SSB) via 'O'. I said the banks are loansharks themselves n charges alot of commisionsHe then replied he also has an investment account at H L***g, to which i bluntly replied government only allows the three major banks to have CPF investment accs and even showed him my own acc settings to prove this to him. https://www.cpf.gov.sg/Members/Schem...stment-s...