Jamesy there isn't a lot to go on so I can't answer your question. What I will say is read more topics here in Love & Dating.
There are people upwards of 30-40 that still have abstract views on relationships due to inexperience or a vicious cycle of anxiety and rejection.
It's not unusual for an aspie teen to have it all wrong about dating / relationships, let alone an NT teen., It's a stage in life which is a developmental one. It's the rite of passage. There is still a lot to learn yet for someone this age under any circumstances.
I don't think the mother meant harm in what she said, just that the son shouldn't go swimming out of his depth and test the waters.