For anyone here that deals or has dealt with OCD, have you ever received an angry reaction someone for dealing with that issue? There was one time when I felt guilty about something and I began voicing my concerns to someone I generally trusted. They got angry at me for being OCD and said something like "I know how you are" and "don't talk to [xyz person] about this!" I think that has made it more difficult to discuss this issue with people.
If you are trying to help someone who has OCD, getting angry at them will NOT help, it just drives the OCD sufferer away from you to other sources. I will add a caveat and say that I DO think it would help in certain circumstances, but that the average person frankly doesn't know how/when to approach that situation in that manner.