I see that attitude as a step away from what we (as a group) should be presenting to the NT population.
Many of those who do carry that attitude, simply because of how NTs' attitudes towards them and have treated them, and they are mirroring that attitude right back at them. I can see why they do it, but it is their choice to make.
I don't agree with that for many reasons - most of us hate being judged and treated in a certain manner just because we have ASD, so I don't see why you would do the same thing to an NT.
You can't expect them to accept our differences if we can't or won't accept theirs.
If any group was going to be accepting of differences, I would expect it to me us, simply by virtue of what most of us have experienced. Sadly, too much of the time that isn't necessarily the case.
I share your pain when I see threads like that. I may understand it but it stills hurts to see it happening.