Although I don't have your extreme reaction, I am repulsed by some patterns. I also have a tendency to look at surfaces with any kind of markings on them to see if I can see shapes or patterns, in the markings. This includes wall paper, floor tiles and linolium, counter tops, wood grained panelling, etc. I realize that some of these already have shapes and patterns deliberately put on them, but I look for additional shapes and patterns within the intended ones.
I don't know what this signifies. Remember, we on the spectrum are all:
A Different Drummer
If a man does not keep pace with his companions,
Perhaps it is because he hears a different drummer.
Let him step to the music which he hears,
However measured or far away.
--Henry David Thoreau