Living a debt free life, avoiding credit cards, saving up for purchases -- all behaviors that are likely to set you apart from friends, family and the general public.
Dave Ramsey preaches "live like no one else so you can live like no one else." Said another way "Don't let the world squeeze you into its mold."
How do we live differently? The most visible evidence of our debt free life is that we drive old ('99 and '97) paid for cars while our friends and co-workers drive shiny, luxury-brand leased cars. We could easily afford a new car payment or a lease payment, but instead we continue to drive our current cars and we are working on a new/nused car fund (one of our 2008 goals is to save $17,000 for a nused car for me).
Most people don't care what kind of car you drive and the people who do care are not worth associating with.