I think they should do both. They should worry about themselves and worry about issues that affect the Jewish community. It isn't mutually exclusive.
Jealousy isn't a pretty image. Do you also protest teens mingling at pizza shops on motzash?
The whole concept of worrying about what others spend is just so strange.
Someone in shul this past Shabbos was saying how nobody should spend more than $20 on all their shaluch manos combined as anything more than $20 should be allocated to better causes.
I said I spent $4 each (A box of P"Y Oreo thins and a small bottle of chocolate milk) on 50 that we gave out and don't regret that at all, in fact many people commented how nice it was to having something they weren't going to dump right into the trash while others commented how this was the first time in their life they had ever gotten to eat Oreos.
To which the person responded, but why not allocate the $180 towards tzedaka. I said what I gave to tzedaka is quite frankly none of your business, but I gave generously to many causes on Purim and that the number would be no different had I spent $20 or $200 on Shaluch manos. So why kvetch about what others spend on it?