That's a silly argument. There is no way to avoid spending money on things made overseas.
I think there's a bigger picture here than just McDonalds. The wage scale compared to what people need to live on is just silly.
You can't avoid it, but everybody with a dollar in hand gets to make choices. Every dollar you cash out on $29 DVD players at Wal-Mart changes the global market of supply and demand, and we have a nation of people who are completely disconnected from how their consumer choices affect their own lives.
As for the wage scale vs. what people need to live on, if breadwinners muscle out high school students for their jobs, does that naturally imply that those same jobs should suddenly be valued much more highly just because an out-of-work factory employee trying to support his/her family just squeezed aside a kid looking for extra money to buy headphones for his iPod Touch?
The hardest jobs I ever worked -- ones I sweated my ass off -- were the least paid and least valued by society. It's hardly skilled labor, and the supply overwhelms the demand. This isn't my take on yelling at a homeless guy to "get a job". But what gets done in a fast food restaurant isn't worth $15/hour, IMO.
The market is always skewed towards paying what we think things are worth and what people are willing to spend -- not what it takes to support a family, regardless of the labor. Minimum wage laws are a little bit of an exception, because people will pay illegals $3/hour if they could get away with it. But let's not pretend that flipping burgers is somehow equivalent to operating a tool & die drill.