If you've ever text the wrong number, you'll understand the loss of breath Michael would have gone through getting this reply back...
He thinks he's got the number for 'Crystal'. He then pleads with 'Crystal' to stop telling everyone how tiny he is. Shit.
As you can see, he pleads with her to stop 'telling everyone he has a baby cock'. Yeah, we can imagine that would be pretty dreadful.
The original guy replies by saying that 'some babies have very big cocks. Baby elephants, for example'. He's not wrong. We've never seen one but we assume so.