Yeah not sexist. Just a 106mm ski is a different proposition for an average guy to an average gal. I'm a big guy and I pretty much ski a 107mm ski as a daily driver on trips. Now the same ski in shorter lengths is very much a big powder ski for some of my female friends.
In which case maybe it's "...large adults..." - there's supposedly 1.5m females over 6 ft in the USA. Some of them probably ski. There's some 16m USA males under 5ft 7" and 50% of the USA male population is below 5ft 10".
The size thing... my son's been a full time ski patroller the past 4 Canadian seasons. 5ft 7", maybe 135lbs dripping wet. Gets 100+ days a season. Those wides were his only skis. Very athletic skiing - lots of air, speed and huge use of counter-rotation. Very little carving happening on the groomers. Put him on my 84mm Rossis and he carves just fine. It's not race and it's not L3/L4 but it's solid. Clearly the skis make a big difference to the technique he naturally adopts.