IMO high functioning (level 1) autism doesnt exist in much the same way that someone who is a bit sad from time to time doesnt have high-functioning depression. They represent perfectly healthy and normal people.
That said their expiernces of struggling to relate to people is very real. This isnt autism however, this is the rest of society (the majority) with crippling personality disorders instead.
The problem with psychology is it assums the majority represent normalcy.