He was trying to say that "making money in a free-market" is fundamentally linked to creating value for someone. It wasn't the 'money' word that you should have focused on, but the 'value'.
On average this way of creating value bottoms-up has undoubtedly produced the largest human flourishing in the history of our species. It has unlocked human creativity and has lifted millions of people from poverty. It is the best system we have been yet able to create. If you disagree - point me to an alternative (even if theoretical).
Of course, as in the case of averages, there is variance. Sure, greed, illegal money making is bad, but the total net benefit is overwhelmingly positive.
I think your blind spot is that you implicitly attribute no ethical value to 'money making'. For you they're disconnected. In fact, it's the oppositve - there is a lot of ethics in money making.