I don't know how those numbers might compare in France, and there are obviously cheaper parts of the world, but the person trivializing $50 might well be in America where that's closer to a week's grocery than a month's for one person.
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For about a year when I was 19ish I managed to get by on $50-ish/month for groceries, by mainly living off rice and beans, with some eggs and other items thrown in. I don't know if that counts though because I got a lot of goods from dumpsters as well; Whole Foods throws out a lot :O
Now I'm way less frugal when it comes to groceries, probably closer to 3 or 4 times that. And I would still take that $50 for bike repair.
When I was in college, I also didn't have much more than 50€ for groceries. I did fine, but I also lived in walking distance to everything. Not everyone is as lucky.
Do people think poor people don't commute? 50$/€ is def. a lot for a myriad of people.