Any insults will probably be handled by Lucy, since Rex is basically the eptiome of [url=http://tvtropes.org/pmwiki/pmwiki.php/Main/TheStoic]the Stoic[/url] and won't bother to respond beyond an eyebrow movement of approximately a millimeter. Lucy, on the other hand, will quite happily trade some truly vicious verbal barbs, so watch out for her...