Yeah.. that was harsh.  I thought he'd say something a little nicer before he shut the door on him.. like, "thanks for coming by" or, "I'll tell her you stopped by.."  But nothing.  I guess the honeymoon for their friendship really is over.  Remember last week,  Lex told Clark we was no longer welcome on his property.  I can understand him drawing lines where Lana is concerned.  I mean, he knows how long they were involved (off and on), and his relationship with her is still fairly new.  I don't think anyone wants their new boy/girlfriend's ex hanging around.  But with Lex, I think it's more than just that.  He really is cutting Clark entirely out of his life.