Take it from a schoolteacher (in science mostly here in Blythe), this is false. Snopes.com agrees.
For several years, usually in late summer, this one floats around. About 7 years ago, it was actually technically almost true only if you looked at the moon and Mars thru a high-powered telescope (they were similar in size), but not to the naked eye on earth. Mars actually gets fairly close to us every 2-3 years (relatively speaking), but it is still hard to see without help (red planet in the NW night sky sometimes but very small). Nothing like Venus, which is very bright most evenings in the Western sky (looks like a distant airplane) and is the brightest thing in the sky on any night except the moon (if there is one).