The first one, as it is written, is not standard written English, because it needs a verb to connect "it" to the adjective "mean". The second one corrects this problem. I'm not sure if you're asking about this, but we have "mean" being used here in two very different senses. The verb (I don't mean") in a sense of communicating information, and the adjective "mean" ("it is mean"), in the sense of cruel, unkind.