
I guess it's okay to make fun of someone who isn't very good at spelling. Maybe the person who put up the letters on that sign had a disability. We can make fun of them though, so long as we don't "trigger" anybody on the Internet. I mean it's okay to laugh in private because no one will know.
EDIT: I'm not pointing this at anybody, but I find it funny how some people are so intolerant that other people aren't informed about everything and get all upset if someone says something "out of line," yet they are so quick to laugh at something without thinking it through.