Why do people feel the need to proclaim they have OCD when they really don't?

I got this guy at work who just told me he has OCD. I asked him "did a doctor tell you this or is this self proclaimed" he responded "self Proclaimed" This isn't the only person i know telling me they have OCD But i met someone who really does have OCD like a heavy case, to the point where they can't use the bathroom if they don't do they right set of steps they have laid out before them they won't go to the restroom no matter how much they have to use it. Where does the line meet on being really neat headstrong on finishing what they do and OCD?