let's face it..some people are not wired for a sense of humor...their perception of levels of meaning in comments runs about like a 2 years olds. You CANNOT use irony and such with them...and when they get offended, all you can do is tell them quietly and forcefully

**IT was supposed to be a JOKE!**

....then you limit your remarks to 'hello' unless there is a clear topic, or you are asked a direct question, then you count 3 before answering.....