Actually, you buddy’s father IS a capitalist… As are you!
It is capitalism that allows you to buy those Soviet Doc Martens. Without capitalism, no one would have every built them and you would not have that choice.
Capitalism is just a word that means Economic Freedom. The freedom to create things to sell to people who might want them. The freedom to vote with your pocketbook for the things you want.
Without Capitalism we would not have cell phones, computers, laptops, etc. Without Capitalism, there wouldn’t be this website to allow you to express your opinion!