This is the "own the insult" sort of statement that I find just reconfirms the other person's argument.
Them: Capitalists are all greedy! ðŸ˜
You: Yes, but we use our greed for good. 😇
How about just saying, "No, fuck you. Get a job."
Discussion
Capitalists don't use their greed for good, they use it for profit. The more their products and services benefit their (greedy) customers, the more profit they have.
And if you're denying that we're greedy, you're just pushing that trait into the "undesirable" bin, a personal shadow, from which it comes back in subversive, sinister ways.
Greed (avarice, covetousness, excessive desire for goods or power, or love of money) is always bad. It breaks one of the Ten Commandments.
http://www.scborromeo.org/ccc/para/2536.htm
Someone who cannot engage in capitalistic endeavors without falling into greed, should abstain, to avoid the occasion to sin.