Is it possible? Undoubtly, since people don't have the same humor and the written meaning is different from to vocal meaning, because of the lack of "intonation" (and facial expression).

Things that people find fun, some others can think it is rude. That's why smiley have been created : what you write and what people think you mean can be pretty different from the way you really mean it. "Lame" is that kind of words that can sound rude.

And your marco, at first degree, unfortunatly can sound like a criticism, a sarcasm.