Okay: at my kids' school, public school, there are several Autistic kids, from Kindergarten to 5th grade. Of all degrees.
These kids, through the school, have an IEP and have an Aide with them, in school and in class, all day.
The other "neuro-typical" kids at the school and in these classrooms, DO NOT... at all, treat these kid any differently. In fact, they are very empathetic to their Autistic classmate(s). And so in class, these kids are mainstreamed in regular classrooms with neuro-typical kids, and they also go to and have SPED related classes. And it is fine.
So therefore, ALL THE KIDS and the teachers, fully know... that these kids are, Autistic. There is no problem with it. These kids have their Aide with them, in class and they are always accompanied and are worked with. Per their I.E.P. And they have Skills Trainers.
Now, all the neuro-typical kids, KNOW that their Autistic classmate(s) are, different. No biggie. They are, classmates. Who happen to have an Aide. No biggie. There is, no problem with it. At least at my kids' school.
Both my son and daughter, had and have, a classmate that is Autistic. Even in from Kindergarten. And it was FINE. My son and daughter, know what Autism is. And they have always adjusted fine to their Autistic classmate and the others too. And the Autistic classmate is fine too, because their Aide is there with them in class. So in each classroom, there is the regular Teacher and an Aide in class with that particular Autistic student. Keep in mind, that a regular Teacher, does NOT have... the certifications or education/schooling background for "SPED" students. Therefore, each SPED child who has an IEP, does have an Special Education Aide in class with them. They are specialists. Who know how to work with the Autistic child.
And it is fine.
Is your child, in private or public school?
Per private schools in my State, they do not have to, have a SPED department or Aides. Therefore, many of the kids who are on the spectrum, have gone from private school TO public schools. Because, the public schools DO have, per the Dept. of Education requirements and IDEA laws and 504 laws, a SPED department and SPED Teachers and Aides. For these students. And then also, these Autistic or SPED students, also have a Therapist they see. Regularly. So the parent is not left to their own devices, of "how" to help their child.
To me, since your child is Autistic, that any school he goes to... you DO need to tell the school.
And whatever school your son attends... YOU as the Mom, need to see and make sure, that the school has a SPED department and Aides at the school. So that, your son can be.... worked with daily. With a SPED specific, professional.
And the school/Teacher, school system... can or cannot make allowances, for him/his condition. Because as I said, that in my State, private schools do not have IEP's or a SPED department. But public schools do. And they are under different laws per accommodations of SPED students.
So you do need to tell the school, whichever school your son attends.
After all, you cannot expect a regular Teacher, to be an expert on how to facilitate an Autistic, student. They are not SPED trained nor schooled.
And yes, the Autistic classmates that my kids' have, do know that they are Autistic. They are fine. The neuro-typical classmates, as you call it, are FINE with them. The Aide for the Autistic student, works with them. One to one. Because, the student has an IEP, through the school. And the Aide also informs the parent about anything, daily, that occurs with their Autistic child.
*ETA: okay, when my kids were in Kindergarten.... they both had an Autistic classmate. The classmates, KNEW the child was Autistic. They know, what Autism is. The teacher educates the students about that in a very caring way. It is all very caring. Per my kids' school, even the high functioning "quirky" Autistic students, have an IEP and an Aide in class with them. Daily. It doesn't matter if it is "obvious" or not to the other kids, per the child's degree of Autism. And sure, not all Autistic kids need the summer time help. My friend's son, does not. But during the regular school year, he does have his Aide and his IEP. He is a very high functioning "quirky" Autistic kid. And the kids know and it is no big deal. And even, MANY of the kids... are very caring to him. Even if he is "weird" and quirky but yet high functioning but yet Autistic. The kids, are very nice to him. At my kids' school, is it NOT "wrong" to be Autistic. And this is public school. All the kids, know. And the Autistic child knows, too.
My kids really actually loved their Autistic classmates. They even befriended them. Within reason and per the Aide's expertise.
There is nothing wrong.... with it being "obvious" or not to the others. It is, what it is. Its okay.