Earlier quoted context omitted.
"Socializing costs" is a widely used term to describe the phenomenon of the public taking on private costs for some real or perceived benefit.
Frankly, this way of talking seems to have its origin in the 2008 financial crisis more than in any actual technical economic language ( https://www.cnbc.com/id/34921639 ). And it speaks more to American's mis-education about what socialism is (or its history) than anything else. Apparently HN does not agree with me, I challenge my downvoting fans to find citations for "socializing losses" in the way you're talking a…
The long and the short of it is that the person you originally responded to was correct to call the behavior "socializing costs." You were incorrect in your response where you claimed that a subsidy is not "socializing costs," since that's exactly what the term means in common parlance. The downvotes probably come from your not recognizing and admitting your mistake.