I'm from Russia, so I don't need to boycott American corporations myself, American corporations boycott me themselves. :D
It's a joke.

But in reality, I just try to minimize my purchases from multi-billion dollar corporations whenever possible. I prefer buying indie, open-source or custom. Nothing about culture. As others have already said, nowadays American culture is mostly common culture. Sometimes I think about buying a Chinese CPU or GPU. And in general, I have a pretty limited budget.