I can understand it, believe it or not. I'm not a huge greiver myself; its not that I don't get terribly sad, but I've had so many pets over the years that losing one doesn't terribly upset me and, even if I do get upset I have a very difficult time expressing it. I don't talk about things like that; I like to 'do' things; there by I'm the type that will go about showering my close friends/relatives with gifts, beer, ect. So making a sign like that seems perfectly....natural to me.
It's fine if I have to explain what exactly SG is to someone. It's not fine if they jump to their own conclusions about it without looking into it themselves.