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I hate to be that guy, but... 

A phrase people can add before saying something nitpicky, like correcting you on some inconsequential fact.

Often secretly means, "I love to be that guy", since the kind of people who say it get a little thrill from correcting others and being pedantic.
"I hate to be that guy, but... you said The Matrix came out in April 1999. It was actually first released on March 31st."

Dont be that guy. 

What you say to someone who is preforming an act of stupidity or just plain lameness. When somebody is being dumb or annoying you tell them DONT BE THAT GUY.
(SO AND SO just unnesscasarily adds to a joke or comment that is quite frankly not funny)

"DUDE, dont be that guy."
Dont be that guy. by JTARPZ October 2, 2009