They don't know how it feels to have one and they're poking fun at those at the sufferers, saying that's funny. To be honest, these kind of people are either ignorant, sadists, or they only want to gain attention.
*Hugs* You're awesome, sis. Don't let no one tell you otherwise. More importantly, don't let the words of a random stranger that doesn't even know you live in your head rent free; especially when there's WAY more people and friends here that care about you.