@karolyn The mc got mad over the golf dude coz he had tons of fortune which he was ready to discard like nothing.
The mom also agreed and said that "Even if we don't live the most lavish life, that is still lot better (than doing what we don't want to)
And here mc himself was going out of his way trampling over his own dreams and wishes and working his ass off for mother's secure future while his own life hanged by a thread.
She basically saying she's happy as long as her dream is achieved doesn't care about making money and living lavish life, whereas mc is trying to secure a good future with all the money she can use to live a easy life (the tons of life insurance money).
But it sounded like the mother was just fine with only going college and she hardly cared about the hard earned money that he had collected via life insurance that he bought working tirelessly. (she seems to be unaware about the life insurance herself though)
Hence the mc got mad, at how nonchalantly they were talking about just chasing dreams was enough for them while turning a blind eye to the people who were going out of their way to secure a better future.