When the conversation turns to "you don't deserve $15" then you know the guy saying it is a gigantic piece of shit. The only place that comes from is a center of pure, undiluted selfishness and "fuck you, got mine."
Talk about the cost to the business, talk about the price increase, talk about how the increase in gas is hurting everybody...there are plenty of legitimate arguments to be made, but like the Tweet above, talking about how "anybody can do it" is fucked up. Anybody can do it, but that doesn't take away from the fact that the cost of living continues to rise, while wages continue to stagnate at the bottom rung of society. You have to give people the opportunity to better their situation, and that starts with offering something that approximates a living wage.