If your son is feeling concerned about being noticeably different, it may be worth trying to get a feeling for the school culture and the attitudes of the kids. We've found that in some schools, the kids are very open and tolerant of differences, in others not so much. In our old school, for example, the kids were very (very!) aware that DS was an odd duck; starting to bring a laptop to class didn't have add much to that oddity. But it wasn't a negative label, it was just an observation. Kids always know who is different. The question is, what do they do about it?
I'm not quite sure how you investigate this from the outside - maybe try to observe a class and some hallway/ recess time, or ask to talk to some kids who aren't quite, er, mainstream? Also ask about - and look for signs - that the school regularly provides a range of visible accommodations, such that the kids are used to seeing them. Around here, for example, any younger class will have a number of kids on wiggle cushions. Some classes have a box of headphones available for kids who want to block out distracting noise. The number of kids with laptops in older classes (grade 3+) is skyrocketing. These kinds of supports are so widely used and available for the asking that the kids don't give them - or anyone who uses them - much thought.
It's usually easier if kids get used to assistive technology sooner rather than later. At 7, classmates still have much more open and forgiving views of what falls in the boundaries of "normal". However, the kids only get more and more self-conscious and worried about what their peers are thinking from here on out. There are quite a few threads here trying to figure out what to do with older kids who are refusing to use assistive tech in middle school. So the sooner you can normalize it, the better. Ideally, by the time the child is starting to feel the major waves of peer pressure washing over him, he and his classmates have long forgotten to notice the laptop.
