Rather, I stated that that kind of mindset is usually more common in individuals on the spectrum. It is, in fact, one of its most common and defining features - even if, on its own, it's not sufficient for a diagnosis. It's relevant to the discussion, even if it's not relevant to his friend in particular.

What further qualification could I have added to make myself clearer? I definitely don't want to be encouraging lazy net-diagnoses, as they're harmful to the people who have such disorders, so I'm genuinely curious how you would rather I have phrased this.