The issue nobody wants to address

[CosmicKirby]

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I'm not quite sure how you don't see the implications of your initial post at all.

BTW calling people lazy scrubs is really not a very tolerant way to behave, and considering how most people in general treat kids with any developmental disability, and the words that they use to describe them, I'm disappointed to see you using that kind of language.

Firstly, you're disappointed in someone, after stating that kids with disabilities are often the recipients of poor treatment. It's clear here that you're trying to imply that the poster, being autistic themselves, should be able to remember a time when they themselves were mistreated in that way, you could even interpret this in a way where you're assuming the poster is also a kid. Then you're disappointed that they didn't resolve to not use harsh language.
Usually when one tries to state they're disappointed in someone it's a rather intimate way of stating disapproval. Usually I'd consider a parent or teacher to be disappointed in me not a random person I disagree with. The way it's being said it sounds like you're trying to relate with the poster purely because of some similarities you both have in life experience, but you're chiding them for not developing the same way you did. The fact that you ostensibly had a list of qualifications, then spoke to someone who might be in the same boat as you in a patronizing matter, as if from some platform of superior experience, is how it comes off as condescending.

I took it at face value as a disparaging remark aimed at gamers the poster thinks are not as good as he is.

That's a huge leap in logic. He's describing them as lazy and not as bad.

In other words, someone that through their own life experience should know not to use disparaging or negative remarks, went right ahead anyway. I simply pointed that out.

And you then said how disappointed you were, in a very 'you should know better' sort of way.

Much less you're misconstruing negative feedback of any kind with prejudice and generalizations. Tolerance has no real relation with criticism in this post or in the general argument.
I'll take the post at face value and assume they are only referring to people who are, in their opinion, "lazy scrubs". I wouldn't go so far as to think that means anyone who's worse than they are.

Being completely frank; it sounds overly defensive that someone would interpret a non-directed insult to mean that.