"prepping" seems to have become a bit of a catch all phrase these days, a little like "survival" used to be. we all prep, whether we like to admit it or not. do you put a coat on if you've got to go out in the rain? do you buy more than a single meals worth of food at a time? have you got a pension/life insurance? is there a spare lightbulb anywhere in your house? have you got anything at all planned for any point in your future? etc. etc. if you answer yes to any of the aforementioned then, guess what, you're a prepper.
i think what most people are asking when they say "are you a prepper?" is actually "do you believe that society is about to collapse any minute leaving behind nothing but roving gangs of hoodies/chavs/zombies, and as a result of this you are currently stockpiling 22LR and andrex triple quilted toilet roll". no would be my answer to that one. however, if "are you a prepper" actually means "do you think that life could take some kind of unexpected twists and turns in the future, and do you think that by having a couple of months worth of food/fuel/cash saved up you would probably be putting yourself in a better position to cope with the unexpected" then yes, very definately, personally i think anyone who doesn't do that should probably start looking after themselves a bit better.