You are reading a "I condemn you" where there isn't one into "you are part of the problem".

If I participate to an economy which exploits third world countries for quality of life and luxury, then even if I do not have a choice, I am part of the problem.

Becoming all defensive about it however suggests that you actually don't give a fuck about using an operating system operated by a fascist enabling corporation, while looking for excuses that it's "not your fault".