Unless you can confirm your suspicions, they remain only suspicions. Confirmation comes either from the suspected Aspie or from an appropriately-trained and licensed mental-health professional.
AS presents as a multitude of behaviors, not just one or two. You can't say that people are Aspies just because they make "too much" or "too little" eye contact, or that they are clumsy, or that they act strangely. Each of these could be caused by PTSD or abuse.
Many years ago, it was fashionable to have "gaydar" - the ability to simply know when someone else was gay. Many adolescent were wrongly "outed" just because they avoided eye contact with members of the opposite sex, were clumsy at sports, or acted strangely.
Now having "aspiedar" seems to be the new fashion.

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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.