@TroysMammy
I'm childless by choice and now aged 50. No one has never spouted this shit to me in the last 30 years. Perhaps childless by choice pp's need to keep away from smug parents.
Then you have been incredibly fortunate. Or you have never left your house since you reached adulthood!
I never had a child til my mid 30's, (only had the one,) and from about the age of 17-18, to when I had my daughter at 35, I barely had a week go by, without someone commenting on the fact that I had no kids. Neighbours, work colleagues, friends, extended family, acquaintances, people I barely knew (like shop assistants, and hairdressers and so on.)
'When are you having kids?' was asked within HOURS of me and DH getting married, and it never fucking stopped. 10 years after getting married we had our daughter, then all we got was 'when you having the next one then?' and 'you have to give her a brother or sister, or she will be lonely,' and 'she will be spoilt without a sibling.'
She is not, and never HAS been 'lonely' or 'spoilt,' and she has more friends right now (in her mid 20's,) than I have had in my entire lifetime. And she is a successful, funny, sweet, loving, intelligent young woman with a great well-paid career, a lovely house, and a wonderful boyfriend.
Conversely, after many years of being child free (and being attacked left right and centre for it;) when I first had my daughter, I had child-free people making all kinds of nasty, demeaning, rude, obnoxious comments about 'mummies' and how moany they are, how if they are tired it's their own fault as THEY chose to have the brat, and how mummies should not expect special privileges in the workplace, and how they just HATE children. 
So in my experience, child free people AND people with kids can be equally obnoxious and cuntish. Many child free folk, and parents are fine, and are lovely, but on BOTH sides, there are opinionated arseholes.
So yeah, I got the 'you don't know love til you have a child' and 'you will never known stress and tiredness til you have kids' old chestnuts.... (from people with kids,) as well as rude and obnoxious comments from child free people (after I had had kids.)
Upshot is, some people - on both sides, need to THINK before they speak!