It doesn't matter what you do, as long as you do it with Class.. Specifically, your Class.

"What a man is depends on his character; but what he does, and what
we think of what he does, depends on his circumstances. The characteristics that
ruin a man in one class made him eminent in another."

With this quote, Shaw is saying that every man is to his own, but the specific kinds of things which he chooses to do and how people around him perceive those actions depends on his class. Certain things which are taboo or looked down upon in some classes make one a hero in others. This is especially true for wide class differences, such as from working class to "world-class." In the lower classes, women (and men too) are expected/encouraged to know how to clean up after themselves around the house, be it in the kitchen, bedroom, and even the bathroom. For the upper class, cleaning your own bathroom would be seen as a disgusting misuse of money, since everyone in the upper class should have maids. In middle class, parents will often say "Is there a maid here?" when a careless child leaves a mess on the table. Rich commie bastards say the same thing ironically, with their pointy-noses held high, if a child begins to clean up after himself. ('Cause they really do have a maid)

Also, Shaw spoke of the standards in each class of society. "Success" has many definitions depending on which rung of the social-ladder you are from. The lower-class would consider success as having a job and being able to get by with the bare necessities, and maybe 'un 'uh tham intertubes too. Middle-class wants not only that, but to move a step up compared to their parents both economically and socially. Success is being able to afford nicer things with savings, being an upstanding and respected individual in the community, and perhaps having a happy family. The upper-class wants money, wealth, and coin. Looking wealthy is extremely important to the wealthy, so success would be considered how prestigious a name one's family has. Everyone is capable of success, but due to character and economic differences, we are mostly limited to success within our own class.