This is a philosophical question for your relationship in that you have bumped up against each other’s different approach to the meaning of life. When we are enormously busy, and full of needing to do the next thing, we rarely have time to reflect on how we are living. However, the pandemic offered many people the opportunity to do just that and rethink their lives.
This should not stop you from instigating conversations and his dismissive attitude is something that needs to be tackled. You can start by inviting him to join you in a discussion at a time of his choosing and tell him that it is of great importance to you. Tell him of your concern that he will shut down the conversation and ask him what concerns he might have about such a conversation .