Just be friendly with everyone and educate them on multi-boxing. I found that a lot of people were simply curious but were unable to type anything more coherent than "WTF j0O HACK NOOB REPOERTED". Your faction will warm up to you over time, and so will the opposite faction (possibly due to fear :-D). You will most likely end up with your own little fanclub that will defend you to death in trade/general chat if someone is trash talking you or answer the more common questions asked about you and multi-boxing. It gets much easier at 70. Unfortunately, you may have to deal with it all over again when you start battlegrounds.

As some previous posters mentioned show off macros make people happy. Here one of mine that gets the best reactions.

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