S.K.
Gifted children will be sensitive to noise, light, touch, etc too. Every person has different levels of discomfort. If your child is very keen to such things, you may want to do some research on profoundly gifted children. These children don't want tags in their clothes, socks may irritate them, lights may be too bright, noise may be painful to their sensitive ears, may be picky eaters, may need less sleep.
If your son won't look at you, won't talk or has regressed in talking, won't show affection, then you may want to get another opinion about autism, because early intervention is key. Otherwise I may look for other reasons he acts this way. None of which are that you are overprotective.