Some people have very odd ideas about prepping. It's as if they think that if you can't adequately prepare for nuclear armageddon / the zombie apocalypse then it's not worth preparing for anything at all.
Extreme scenarios are highly unlikely but short term supply issues - power, water, basic groceries, medicines, petrol, internet - have not been uncommon over the past few years and I can't see them becoming less common while the amount of uncertainty in the world is increasing. Why on earth would you not prepare for those things if you were able to? Or being stuck in for a while because of snow or flooding, ill health or government rules?
Those things are absolutely not the end of the world but they're a lot less stressful if you know you're OK for a few days. It reduces anxiety for a lot of people to know they'd be OK if this, that or the other was not working properly for a short while.
But for a lot of people the idea of 'prepping' makes them very anxious because it means thinking about 'what if?' and they don't stop at the idea of short term issues, they go all the way to the most extreme and unlikely scenarios. Hence the sneering posts.
The preppers board here is down to earth and sensible, OP. Basic advice is start by thinking about what you would need for the next 3 days and if you have a car, try to keep above 1/2 tank. No, you won't survive nuclear armageddon or the zombie apocalypse but you have a much greater likelihood of being able to ride over the small bumps without major hardship.
www.mumsnet.com/Talk/preppers
I'm a lurker there but I've had several reasons to be grateful that I took their advice over the past couple of years.