Some of us think that if you tell others that you have it, even when you managed to hide it, it sometimes makes it harder for others to want to be around you.
The only times I even hinted that I have it, is when I get into a discussion about the things I have the most knowledge about. (Like Social Studies. I Took the GED, and I nearly got a perfect score on the Social Studies Portion of it (scored a 97%, or 720 points out of 800.(Which itself means that I know more in that area than the average student, which those normally scores around 410-450 points out of 800.)).)