You are right that he is making some heavy-handed generalizations, but then again, he is replying to the OP making a very populist generalization about people with wealth as well, as if he has figured everything out - and OP isn't getting any flack for that. It may be the difference between American culture / "the new rich" vs. European culture, but my experience with people with great material wealth is very different and not easily generalizable.

> If your bar to helping others is ending all suffering within yourself, then I'm afraid we're all going to be living a very lonely existence if we followed your lead.

Logically that does not make any sense. If everyone is able to relieve themselves of their own suffering (no one else can anyway, in an ultimate sense), which includes loneliness, then there would be no more suffering. This is a Buddhist mindset that seems kind of harsh at first, but it's a reality people benefit from once they accept it: you must become your own savior. And once you are in good place, even just mentally, it becomes very natural and easy to help out others.

Problems only start when people reject this idea, and think they have all the answers to all the problems, and start enforcing their beliefs on others using violence - which is a trend we're seeing more & more these days.