I think Steve has the right attitude. I would do just the same if my wife did something along those lines. I wouldn't snub anyone for appreciating their heritage in a unique way and having something "fun" to remind them of that. And, Steve, I'll note that I had to break out a magnifying glass to read the tiniest of fonts that you have in your signature block!

I don't think there is anything wrong with the "square-foot" thing as long as one treats it for what it is and NOT pretend they are something they are not.