I agree with him tho, just make up your own style, there's no need to wear expensive stuff just to accomplish some kind of fancy style
That's not how it is at all. Do you not have a desire to dress nicely? It's expensive because it's popular. It's popular because people like how it looks. Not all streetwear has to be expensive. Streetwear specific brands are expensive, but you can go thrifting for nice clothing that will go with a "streetwear" outfit.
Clothing is a way of expressing yourself, that would be my own style.