"Do you have any OCD like habits?"
"Rarity's OCD about her art makes her not generous"
"I suppose I'm kinda OCD!"
Instead, how about
"Sometimes I feel so stiff and sore! We're all a little arthritic, huh?"
"When my leg falls asleep, I totally get what it's like to be in a wheelchair."
"Urgh, I've got a lump on my face. Stupid cancer."
If you're going to trivialize serious problems that haunt people and hurt their everyday lives, go all the way.