They say that because the listener is so focused on exactly what is said, likely adding non-relevant context or missing context, and dragging out things instead of understanding the message that is being conveyed.

For example, when I say pick up trash to mean things to throw away and the kiddo focuses on whether she considers something that should be thrown away to be trash she is focused on what I am saying but not what I am telling her. "It isn't trash, I just don't need it." Then just throw it away!

Ahh yes, finally, good fucking autism

Yes, but also, this assume the respondent's social network hasn't been filtered already

Jesus just how autistic am I?

I think it's the other way around actually. I was told once that if you're the type to never enter Strongly agree unless you 100% agree, that gets factored in to the score. I usually take these tests with a bit more nuance but I'm not inclined to believe the test is that well designed unless I see how the score is calculated.

In any event, anyone with a tablespoon full of self-awareness can pretty much score whatever they want on the AQ50. They're just hoping you'll fill it in as honestly as you can but it's essentially 25x the question 'I am autistic' and 25x 'I am not autistic'.