I associate "rich" more with a lifestyle than a wealth status; though it is odd to call someone living paycheck-to-paycheck "rich", the fact is spending at a certain level/on certain things means you definitely *have* enough money for "anything but not everything". So maybe that's it, in my perception: rich means you have the personal and/or financial capital that you are not worried about your needs, and can accomplish at least a few "luxury" goals with that cashflow, should you make them a priority (one of those could be saving a 'stache and becoming FI! :) )
Am I rich? a nonexhaustive quiz (for answers <0, put 0):
__ # of times per week you have household help (maid, housekeeper, gardener, nanny; if 2 services work simultaneously, counts as 2, etc).
__ tens of thousands of dollars you spend on your chidren's (K-12) tuition annually (if >$0 but <$10k, 0).
__ # houses you own, minus 1
__ # cars you own - # drivers in household
__ # of designer clothing items or purses you own
__ avg # fancy vacations per year ("fancy" defined as staying in 4+ star hotels and eating out 2+ times daily; or all-inclusive; or traveling first class with cash (not upgraded)).
__ # of plane(s), helicopter(s), or yacht(s) you own and "support" (i.e. maintain), x5
__ # pieces of art you own that you purchased for over $1000 (2016USD) ($5k if from someone you know)
__ # bottles of wine/liquor in your possession that you purchased for over $100 (2016USD)
0 points: no outward signs of being rich (might still be wealthy and very Mustachian :) )
1-5 points: you might be rich; or you might value a few things very highly and be scrimping to afford them on a modest income.
5+ points: probably rich. If you post on the internet about how you can *barely* make it on $300k anymore in this country, you'll get laughed at. If you lose your job tomorrow and go bankrupt because you have no savings, you really only have yourself to blame. You may also be marvelously wealthy, well done!
Note: basically, this identifies the "not-not-rich" rather than "the rich", I think. Also it was kind of fun to write. Feel free to add if you like it.