Absolutely not - I could not afford to rent at today's prices, so no, I don't look down on renters per-se. Unless anyone on your street has told you that they don't speak to you because you rent, then it might be worth while seeing if there's anything else you might have done to warrant the response. I say this because the whole renting thing could well be your hang-up, and be the easiest thing to attach their aloofness to.
A couple of years ago I had the great misfortune of working alongside a woman who told me on at least two occasions that one of the dads at the school gate has a problem with women, because he'll talk to her husband but never to her. Just because she's a woman. I mean, being objective, I'd have said it could have been that he just didn't like her, due to the fact she had her head so far up her back-side it's a wonder she could breath. My dislike of her had nothing to do with her being a woman, and everything to do with the problems she caused me.
This said, one of the neighbours where I live now seemed to think people earned their stripes on this street, and that the more years you've lived there, the more entitled you were to make friends with other neighbours, to put your bins out before others, to have more rubbish than others. She'd been here many years longer than most, and had appointed herself top of her tree. It never sat easily with her that no one else gave a toss about the game she was playing.
She once had a row with someone next door, to which she blurted out "you only rent any way", as if that had anything to do with what they'd fallen out over. She was quite troubled, that one.
What I do look down is when people (buyers or renters) make a street look like a shit-hole. The street where my parents lived since 1969 was beautifully well kept when I was a child, and almost everyone who lived there then was a homeowner.
My parents have since died, and by the time I sold the house last year, a large number of the houses had been bought up as buy-to-lets. Some of them looked horrific, and cars parked all over the grass verges. I don't know if it was the renters or the owners, but there was a distinct lack of pride.
Then again, given the amount of money people pay in rent, I do wonder if they can be expected to maintain a property to a decent standard.
My sister has always rented, she has never worked full time & when she did work it was for less than 20 years (she's mid fifties now). One way or another, she has always had help with her rent, she's moved around more times than I can count, she'd lived in decent areas and areas that were much less so. Each time she's let the places go to pot, she's walked out leaving furniture behind, I have bought her new things and given her way more of any excess I've had, and she's very easy-come, easy-go. I would hate to have her as my neighbour. She is the type who give renters a bad name.