Why don't you ask them "where will these resources will came from"? This isn't a hypothetical we're discussing, most of Europe has protected retirement.
The original commenter was saying something more like "we will work until we die, but that's okay, because capitalism is great! And it's not like you would get to retire under any other system anyway"
And situation in countries in France where the average retiree now somehow has higher disposable income than those still working is far from ideal.