Its amazing how we all are on the same page.
But I do want to bring out that as much as ADD is a real challenge using it as a crutch would basically mean you are doing nothing about it, this friend of yours obviously does not understand ADD but it is our job to not hide behind it and try everything in the world to help us with this challenge. THATS NOT A CRUTCH!!!!!!!!!!!
If you are doing nothing about it and only complaining about your challenges and not seeking help then that can definitely be defined as using ADD as a crutch.