I really don't mean to be a dick here, but aren't these two statements in conflict?
1. If you've met one person on the spectrum, you've met one person on the spectrum. The range of non-neurotypicality is extremely broad and highly individualized.
2. Most spectrum people have input filters instead, developed to keep them from being hurt by the world.
This isn't a leading question, as I don't really know enough about the subject to have an opinion. But I'm generally skeptical of all message board commentary about autism. So I'm not saying you're wrong, I would just need more convincing before I'm persuaded that most autistic people have "input filters" to prevent them from "being hurt by the world."
More generally I can see why grouping people into "output-filter" types and "input-filter" types might be a good faith exercise in empathy...but is it actually true? Going back to your first statement, you're talking about autism as something highly individualized. How is this compatible with an idea that seems to suck all nuance out of it, like a binary grouping?
I also have a problem with Gadson's claim:
“People with my type of disorder, it’s not that we don’t have emotion,” Gadson said. “It’s that we have too much emotion. We can’t push that stuff back.”
On one hand I can see why this is an attractive idea, for the same reason we'd want to empathize with "input-filter" people. On the other hand I see two problems. First, is Gadson's claim a useful one? When people perpetuate the stereotype that autism causes emotionlessness, do they actually care about the interiority of the person or are they talking about behavior? If what they're trying to communicate is in regards to behavior, I don't think Gadson responds to the heart of their meaning; which is probably something more like, "I'm uncomfortable around autistic people because they're robotic and unsympathetic" (NB I'm not expressing a personal belief here). In a very real sense they're still right despite Gadson's reply, because they're talking about behavior and Gadson is talking about a rich interiority.
The second problem I see with Gadson's comment is that it seems like he's generalizing autism again. Do all or most people with autism want to be described by the comment, "I actually have too much emotion"? Would they consider that mostly correct, a gross oversimplification, a useful or useless oversimplification, or wrong outright? It seems like no matter what we do, we can't get away from the problem of a few people speaking for everyone when it comes to autism.