That’s not even really being a good liberal in the absolute sense. A good liberal in the absolute sense will economize himself so he can benefit the needy.
But like “gay” (a group of people that has some of the grimmest souls one ever met) the term “liberal” has long been an oxymoron in our secular politics.
Very few, if any, liberals actually practice what they preach. Liberals who practice the "bohemian" lifestyle do so because they're too lazy to work. Successful liberals who do make decent money are generally stingy with charity except for a few "feel good" causes like Planned Parenthood or Greenpeace... but otherwise wouldn't hesitate to crank up the AC when they get the slightest bit uncomfortable.