Always infuriated me. Still does.
This is a problem with you, not them.
Are you furious when you see a dude driving around in leased Mercedes SUV and living in a McMansion that costs 12 times his annual income? Why is your response anger and not pity?
Some people will always make poor financial decisions, perpetuating their own relative poverty by their own inability to save money and build wealth. This is not a reason to be angry at them.
Where their meager incomes come from should be irrelevant. Food stamps are exactly equivalent, in economic terms, to the mortgage interest deduction or the 0% long term capital gains rate, both of which are only available to people below a certain level of income. It's just government dollars being spent to favor a particular interest group. It's not "your" money they're spending any more than a rebate for buying energy efficient appliances is "your" money being spent by your eco-conscious neighbor. Dollars are fungible.
If you envy their meal choices, then feel free to also go into debt to buy sushi and steaks and be just like them. A better option, though, is to recognize your own superior impulse control and long term planning skills, be satisfied that you are making the right choices for you, and feel sorry for the poor fools wasting their income on foods they can't afford.
Otherwise this is just the classic dog-whistle race-baiting that Ronald Reagan used so effectively when he tried to sympathize with the frustration you (the supposedly white listener) feel when waiting in line to buy hamburger when some "strapping young buck" (code word for young black man) is in front of you buying T-bones with his welfare check. Reagan knew how to mobilize his voter base by appealing to issues of class and race in a way that wouldn't be called out for being explicitly classist or racist, and you're just regurgitating his 30 year old bigoted talking points. Aren't we past this yet?
http://www.urbandictionary.com/define.php?term=Strapping%20Young%20Buck