Being good with details is not what makes autistic people bad at socializing. Autism causes people to not develop normal social skills. That includes difficulty understanding or using non-verbal communications, limited ability to pick up social cues or follow unwritten social rules and such.
Some people with autism have a great eye for details, while others don’t. That doesn’t necessary affect their social skills though. It’s not enough to notice details well, it’s also necessary to understand the meaning behind those details. That is what’s difficult for people with autism. We may see body movements and facial expressions and we may hear tone of voice, but we don’t necessarily have a clue what people are consciously or subconsciously communicating with those non-verbal cues. We don’t pick that up the meaning of those signals naturally like neurotypical (non-autistic) people do.
Did you know that up to 80% of all neurotypical communication is thought to be non-verbal. That means that the non-verbal cues are not just minor details, they are a huge and important part of neurotypical communication. Since people with autism generally have a lot of difficulty with non-verbal communication, that means that they have difficulty with up to 80% of all the communication that is used by other people. It is no wonder that we have great difficulties socializing and interacting with other people. We only “get” around 20% of all the signals and messages that people try to send us or use amongst themselves, but people generally assume that we get all or most of their messages and then they get confused or frustrated when we don’t react the same way as they expect (which happens because the message they sent and the message we received were not the same) or why we don’t seem to understand things that they find so simple and natural that they take them for granted.
Regarding being too detail oriented, some people with autism tend to get fixated on certain details, which may cause them to miss the big picture. Neurotypicals may only pay attention to a specific detail for a second and then move onto something else, or they may not notice the detail at all in the first place and may stay focused on the big picture rather than the details. People with autism may however notice details that other people don’t and they may pay so much attention to one specific detail that they miss everything else, hence missing the big picture.
I have an autism spectrum disorder myself.