He was trying to send a message to all the swingers in the audience, but when some random photog asked Justin Long to reveal which of his former flames "is better" -- the Mac Guy uploaded a verbal asswhoopin' on the guy.
The papper tried to recover -- but the damage was done.
Mac Guy Must Choose -- Drew or Kirsten?!
10/21/2008 7:00 PM PDT BY TMZ STAFF
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