Report him to Steam.
Ask if he is an Admin.
Call him a hacker.
EWWWWWWWW GAY MARRAGE. EWWWWWWWWW!
Meh, I don't really care.
Meh, I could always get one for free.
What color do they taste like?
...by finding them.
Buying from the market.
Buying from the Mann Co. Store.
Trading with Friends/Strangers.