Google returns over 20,000 results when searching for ponzi on bitcointalk.org.  Do we really need another thread talking about what has already been discussed 20,000 times?  Can't people just go read the previous few thousand conversations?

http://lmgtfy.com/?q=site%3Abitcointalk.org+ponzi

Yes that's probably it. Don't invite this person to your 4th of July BBQ unless you want to hear more of their lazily formed opinions.

Ignorance is bliss.

since he does not know the definition of a [Charles] Ponzi scheme and bitcoin is clearly not one who the hell knows

each and every bitcoin is worth the same at any given time and has no set value, by any definition it is not a [Charles] Ponzi scheme

prices go up as people join and down as people leave this is simple market supply and demand nothing more

third  result when i googled "what is a ponzi scheme"
http://www.sec.gov/answers/ponzi.htm

maybe he is an idiot 

Yes

ROFL

US treasuries are a Ponzi scheme, since mature treasuries are paid back by issuing new ones all the time

BTC cannot be a Ponzi scheme because the amount of BTC is limited and does not grow exponentially, like US debt does and most other countries debt

Government bonds = mother of all Ponzi schemes

Most retirement schemes I know are turning into Ponzi schemes because of changes in demographics.
Worst, retirement plans are sometimes Ponzi schemes that you have to pay for whether you like them or not, because your government says so.

Your neighbour should not worry so much about bitcoin because no one is making any promise or forcing him to use it.