In my opinion, people need to learn - and in many things, already know - that things have scale. For example, with "pain": a bruise, cavities in teeth, kidney stones, migraines all hurt, but the level of effect on someone's life is vastly different.

Also, people have no problem minimizing the things as well, where pain again is a good example. In many situations, if it cannot be seen, secondary parties easily disregard it.

So, in conclusion, this confusion with the autism levels should not be a problem.