Autistic people tend to dislike, or at least be uninterested in, change. Many have strong attachments to objects, places, or routines, and become very upset if forced to abandon these things. Something that seems silly to others may be very important to an autistic person. Most autistic people have a few very intense interests, that may seem almost obsessive. These could be as ordinary as sports, as technical as neurology, or as odd as memorizing train schedules.
Autistic people take their special interests very seriously.
Autistic people are often aloof, and may be seen as extremely shy. However, while some may be very socially anxious, others are not anxious about people, but either uninterested, or are unaware of how to interact with or approach others. Some may not notice people, because of being absorbed by other things. Some are very interested in getting to know others, some may not care, and other may actively avoid social contact. The lack of normal body language may make them seem more distant or unemotional than they actually are.