Calling an interest OCD is so ignorant. Interests and hobbies with Asperger's are often called special interests because sometimes they get very important for the person and the person really goes deep with it and learns everything. It has nothing to do with OCD, it has to do with being able to focus a lot and focus on a narrow aspect of something.

OCD isn't an interest, OCD is horror. It makes you do things you hate doing like scalding your hands under hot water because of "germs" or refolding a sheet 10 million times because it doesn't feel right and perfect, or doing things like having to step into a room with the right foot first or "the world will come to an end".

Sometimes I wish experts were real experts.