After a very long 'discussion', known in some circles as an argument, Pepper drafts a carefully worded reply, which goes through three drafts before Tony does no more than glare at it disapprovingly and grunt:
Lex,
Thank you for your regards. We appreciate the good wishes.
- Pepper and Tony
It was decided that he must be trying to play with their heads, and if they ignored him, Lex would know he'd succeeded.