First of all, you made no implication whatsoever that this could be a "joke". Someone with glaucoma could think grumpy cat is adorable, so it could easily be taken that you made that as a serious comment. Second of all, I actually don't think grumpy cat is adorable. This meme was mostly made as a way to see how many people actually thought grumpy cat was cute. But I guess that went way over your head. Now I know I made no implication that this meme was a joke (like you making none with "glaucoma") but you shouldn't criticize people of something you yourself did.