I do not have alopecia. However, I went to school with 2 different people, and I can tell you how they were treated.
#1 - He was a kid I went to high school with. He was a black kid, so that he was totally bald was not that unusual, as lots of other HS boys also had shaved heads. He was popular in kind of a goofy way: everyone knew who he was (I think because he was bald), but he was a nice guy, so everyone who knew him liked him. I have a positive memory of him, and it didn’t appear he was ever teased or anything. (of course, maybe he was earlier in life, I don’t know)
#2 - She was a gal I went to college with. She wore a wig. It was a pretty good one, and I knew who she was for a while before I realized that she didn’t have eyebrows or eyelashes, and hence it was not her real hair. I remember envying her because she never had to shave her legs (okay, okay, it’s dumb, I know). I also remember all the guys postulating on what she looked like naked, and what it would be like to sleep with her. She seemed to be pretty popular, although I didn’t like her(thought she tended to look down on us “nerds”). She was a pretty gal with a great figure, so she wasn’t often without a date. On the surface she seemed to be pretty well adjusted about it. Midway through college, it came out that she had gone on Montel Williams and had removed her wig. So it became the big thing to talk about that she was bald.
I think the bottom line is that if your child is likeable and friendly, those who might stare, etc. will be won over by personality. Once that happens, the lack of hair won’t matter.
I suspect, though I obviously wouldn’t know, that being a boy might help. I would imagine it would be much more “shocking” to see a bald woman than a bald man, since so many men either go bald, or choose to shave as their hairstyle. Not many hairless women out there, so they tend to get noticed.
Not sure if that helps, but hey, I gave it a shot.