I have a close friend who is autistic. Until I got to know them better I didn't know they were autistic, and as it was, they only got their diagnosis as an adult, during the first year of our friendship.
Friend makes eye contact, is very empathetic, very clever, doesn't stim. However certain environments are highly stressful, they work extremely hard to 'present' as "normal" by not immediately walking out of a room that is too loud/bright/hot etc.
My friend is very adverse to being called 'a person with autism'. Their explanation is that it is like saying 'a person with a hat' or 'a person with a suitcase' - the hat or suitcase can be removed/put down, but autism cannot.
As for the ' spectrum' my friend is clear that this is q harmful way of considering things. Essentially if you have met one autistic person, they don't form your template nor set your baseline for what an autistic person is it does.
Autism frequently has co-morbid conditions such as depression, anxiety, OCD, to name but a few, and these also drive behaviours that may, because of the autism, present differently.
Equally, a neurotypical person may demonstrate traits that have been associated with autism, but that does not make them 'a bit autistic'.
Off tangent somewhat but I have a friend who has mobility issues. For the same analogous reasons as my autistic friend they define themselves as 'disabled' and not 'a person with a disability'.