This is one of those spots where I'm not sure you can say anything and win. Because:
On one hand, selecting for disability and disorder absolutely is eugenics and should not be encouraged.
On the other hand, we already select for some disabilities and disorders in order to protect the kids who would have them! Tay-Sachs is the obvious example; we do not want these children to die horribly so we try to make sure they're not conceived in the first place.
On the other hand, a potential parent selecting for disability is concerning because not all disabilities show up in the womb, and some are acquired. Do we want to encourage people to become parents if they're already wanting to walk away from any difficulty?
On the other hand, there are disabilities and there are disabilities. What if a potential parent is like "listen, ADHD I can handle, but the disability you're talking about is so severe I don't think I could handle it"? Is that eugenics, or recognizing one's own limits?
On the other hand, if we could ask the fetus "here's what you'll deal with; do you want to live?" would it say yes or no? Some quadriplegics love living. Some amputees who lost part of a leg will say they wish they'd died instead. Every disabled person will have a different answer, including two who have near-identical disabilities and life circumstances. Hell, I'm disabled and whether I'm saying "it doesn't bother me" or "I wish I was anyone else" comes down to the day.
On the other hand, does it make a difference if the answer to "why do you want an abortion" is "I don't want a baby" or "I don't want a baby I perceive as defective"? Do we judge one but not the other? Why?
I could go on like this for hours. I don't think OP is right and I also don't think they're wrong. I'm not sure there is a "right" answer. I definitely don't think there's a one-size-fits-all answer. Life is THE most annoying bitch on earth that way sometimes. And insofar as there is an answer, I actually think it lies with creating support, not restricting abortion. Would you still say "abort" if you had an extra $10k a year? What about someone to watch the kiddo on Saturdays so you could have some decompression time? Is there a load-bearing straw we can remove to spare the camel's back, or is the camel simply not capable of hauling this particular shipment of straw?
Sometimes there are no good answers.