Hate to burst the sling-bashing hippie mama stereotyping bubble and at risk of outing myself... but I'm well into slings and most people would say I'm an "established babywearer". I own plenty of high end slings Artipoppe, Woven Wings and Handwovens as well as Didys, Girasols and Oscha and can use a variety of wrap sizes to do different types of carry. But I also own a couple of pushchairs, vaccinate, I don't clothe bum or use Amber and I most definitely have a life beyond being a mother. Shock fact! I even go out for nights out with mums I met through sling meets! Despite having a bf toddler at home! 
I've never once been judged or looked down on for my choices at sling meets. And I've been to a lot of meets. The only places I've been judged is in regular parenting/play groups where using slings seems to give a greenlight to people to stereotype you and make assumptions about you. Hell, even my HV was surprised "mums like you don't tend to vaccinate"?!?!

My experience of sling meets and established babywearers is that they're a pretty widespread bunch. Generally skewed more to Dr Sears/AP type parenting but still a vast spectrum. So forgive me for being fairly
at the idea that it's exclusively the domain of the uber-crunchy.
Fwiw I also worked full time in a "real job" whilst breastfeeding and using slings with my 2yr old. 
I used to help run a sling meet to let new parents try out slings but, tbh, I stopped volunteering my precious time because people would regularly turned up late or not at all and it was disheartening after awhile.
It's not hard to see the attraction in meeting with people who are interested in geeking out over the latest release and who understand the obsession without having to go through the judgey stereotyping and the "why do you need more than one?" "It cost how much?!" questions (Answers: "No, but a bit like shoes or handbags or clothes it's nice to have different colours and blends for different situations" and "Too much probably but it's my money, I earned it and I can spend it how I see fit")