Can't tell if this is truly in good faith or not, but I'll explain a little.
1) The fact that it's a joke is only part of the problem. We get it, we love to joke about fates and item descriptions making fun of races lore. There's lots and lots of such things about lalafell getting eaten by whatever, the elven salt lick, etc. Everyone has it in some form or another. But that's where its mainly kept... in descriptors not constantly thrown in a person's face. The scratching post? Not even labeled as specifically a miqote only item. It's just the slightest mention in the description. "Lalafell Lifter" makes it sound as though it is something made for us as an accessibility thing. Which is great! We've been begging for more lalafellin accessibility furniture made with us in mind.
But its been put together in such a way that invites making fun of lalafell characters because of the way it looks. It's not a nice neutral housing item that I can fit in with the others and make it look normal. It looks like an actual toddler high chair, minus the tray. I thought this from a glance. A lot of people did the more they looked at it. And, just like this thread has demonstrated there's many people for a little change, those who like it as is, and those whose only purpose being here is to dunk on our feedback.
2) There's a different between child-like and youthful. It's the same age old meme about dwarves, goblins, halflings, etc. Some of us just like being small because it fits whatever we're going for. Others just want to RP that way. Or we're just going straight up gremlin mode and lalafell fits the best for those type of shenanigans. I'm not going to argue about venues and all that regardless of how dumb I think it is (Like really... it's all fiction regardless, and has been mentioned numerous times they're considered to be just as adult).
The important part is not being demeaned and treated like we're actual toddlers. We get enough harassment as is just for existing. I can't tell you how many times I've simply been standing somewhere or joining a duty and some schmuck throws an absolute fit. We're playing a video game and we're constantly getting accused of being into nasty things like a pedo or whatever. This is just one more thing for us to see on top of everything else, those who love our characters as much as you love yours.
I personally go out of my way to make my lalafell look as adult as possible with the adult options that were given to us. Facial hair, neutral/masculine clothes, etc. Clothes are literally just that: clothes. I'm not going to chide the tiny au'ra girl with the doll face for wearing cute frilly pastel dresses because they want to look youthful, who makes childish little giggles and also throws a temper tantrum stomping the ground emote when she's mad.