calling someone a prepper is an adhom, just like calling a greenie a tree hugger. just another way to dismiss something that is emotionally confronting so one can continue to feel some comfort in their own bubble.

Well yes and no. You will always have some have actually prepared; people, and you will have people who cosplay people who are prepared. The latter see buying things that help survival more as a hobby than a thing that needs to get done in order to survive. It is the difference between a hunter who needs a gun as a tool and a gun nut that collects guns because he likes theorizing over minor differences between them online and nerd out about them.

That doesn't mean anybody who does a lot of research online or buys a lot of things is a obsessive hobbyist of course. The difference can at times be hard to tell from the outside, but someone whose first thought when an apocalypse brews on the horizon is to get weapons and turn their home into a bunker, instead of e.g. relying on a strong neighbourhood network and helping others is certainly a specific type of person. The problems that will arise are of the type that will be hard to solve alone. E.g. prep all you can, but what if your family member needs a doctor? Or something is fucked with your electrical system and you need someone.

This is why people make fun of preppers. Not because being prepared is a bad thing (it is not!), but because you get the feeling some of them can hardly wait for the end times to come around so they can test drive their gear.