Sorry but you can't paint all autistic people with the same brush. It is such a huge spectrum and children with autism who manage to achieve such milestones like GCSEs and a healthy social life don't invalidate the ones who struggle to leave the house or can't cope in a classroom. I don't watch the vlogs very often anymore but I was an avid viewer back in the day and can't say I noticed her rolling her eyes when people were talking - she is a teenager now which might explain why she comes across as selfish and isn't interested in hearing about what others have done. That isn't anything to do with her autism though and I won't sit and judge a child who hasn't asked to be put on the internet daily for everyone to watch. Regarding the tantrums, which I would describe as meltdowns, again down to her autism, I always remember her being extremely stressed when something like a birthday party or a big change in routine was looming. I don't remember her crying because others were going to parties and she wasn't, moreso because she was terrified of going herself. Having another person in her home (Jasmine) who wasn't a 'regular' must have been really confusing for Lacey as a child, even if it is her sister. I do think Steve has massively blown this anxiety out of proportion to justify homeschooling her though. I believe Lacey had a 1:1 or some form of regular support at school which wouldn't have been funded if there wasn't a lot of concrete evidence that she needed one. I really sympathise with your situation with your son - I work at a primary school and there are more and more children each year who clearly aren't in the right setting or don't have the right support but there simply isn't enough funding or places at SEN schools. Steve and Rache are big lovers of lazy parenting for a quiet life but I don't think that makes Lacey's autism and the many struggles that go along with that less real.
On another note, why was Steve waving a camera at Lacey and asking her a million questions when she went outside to be sick from a migraine and why did he leave it in the vlog? Maybe the kids should do that to him the next time he has a dodgy stomach and is vomming all over the bathroom