Well, many people who are homeowners are not judgy and sneery at all, and some people I know who own are lovely, and don't give a chuff about us renting. Howeverrrrr... there are a few homeowners who do have this attitude sadly. We rent a social housing property, and are asked regularly by one particular couple why we rent, if we will ever buy, and if we realise that renting is 'dead money.' 
This particular couple have a £163K mortgage that they took out 4 years ago at the age of 50. A £163K mortgage at 50. Fuck that. Just so they can say, 'oooh look we OWN our house.' (Errrrr, no you don't actually!) And within 2 months of them moving in, the boiler packed up. Ta-ta 2 grand. They are constantly broke, never go anywhere, never do anything, and never buy anything, coz they are ALWAYS forking out for house repairs.
We rented a little housing association flat from 1989-1994 that cost £18 a week at the start, and £26 a week when we left. We were constantly loaded, tons of surplus income, both working full time, new cars, loads of holidays abroad. Then in the mid 1990's, we made the decision to buy a property after constant nagging/ goading/ put-downs/ borderline bullying about us renting; like we were some kind of low lives for renting. (We were in 'office' jobs working for the local authority, and so renting didn't fit the 'persona.')
There was this 'you're a better person if you are a homeowner' train of thought back then, and I think it still exists tbh. (In the minds of some people......)
SO, we bought out first house in 1994, and had 3 different homes over 18 years. For the entire 18 years we never had any surplus income, and got further and further into debt, as each one of the 3 properties seemed to have one thing after another go wrong with it.
We were on a modest income, and could not keep up with escalating mortgage rates and high cost of home repairs. Loads of people we knew seemed to have a dad/uncle/brother etc who could do stuff for them, but we had no-one. So we had to take out loan after loan after loan to pay for stuff. We struggled to keep up with the loan payments, and house repairs.
Long story short, in 2012, we sold up, and used the equity to pay off our debts, and went into private rent. We then went on the social housing register. We struggled for 4 years with the high rent and the frankly, very poor landlords who didn't give a shit about the property.
In 2016, we were offered a little 2 bed house; £69 a week rent, permanent tenancy, all repairs done, lovely little cul de sac, great neighbours, close to woodland.
For the past 18 months we have never felt so free, and we have not been so financially well-off since the early 1990's. We have also not felt this stress-free since the early 1990's. No more panicking if we hear the heating popping, or worrying about the roof blowing off if there is a storm. Friends tell us that we look 10 years younger than we did 6-7 years ago.
If people want to buy, and it works for them, and they have the means to get repairs done cheaply, and they have lots of excess income after the mortgage, and 1000's and 1000's saved for unexpected house repairs, then good luck to them. Us however, we should never have bought a house. It brought us nothing but misery and penury and debt.
As I said, we have never been so happy and relaxed and chilled and financially secure since securing social housing. We pay full rent, and have never claimed housing benefit, or council tax benefit, and it really boils my piss when people say social housing is funded by the taxpayer. No it ISN'T. It's funded by the bloody rent people pay!
Our only regret is that we ever gave up our social housing property in the mid 1990's. Still, it's all good now. And anyone who poo-poos us can fuck right off, because we have never been happier. And as a few people have said, many people rent on other countries; it's just the British that seem to have this bizarre obsession with 'owning' a property. (And let's face it, most people never own it anyway; the sodding BANK does!)
But yeah, YANBU @Malificent7 some people DO look down on renters, even if people choose to deny this fact.
Oh and some people (who rent) may not treat the house as good as if they owned it, but WE do. Especially as it's a tenancy for life. 