Well, NT people are not really obsessive with small talk. It is just considered a mild middle point easy to manage, with no polemic issues and where you can relax and enjoy social interaction. The content is not important, as long as it's not cumbersome. Indeed, the more inane, the better, since the goal is to relax and enjoy company, not to share information.
For a NT, chatting about any aspie's obsessions is nor relaxing neither enjoyable, so it takes away the main purpose of small talking.
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1 part of Asperger | 1 part of OCD | 2 parts of ADHD / APD / GT-LD / 2e
And finally, another part of secret spices :^)