Here's a disappointment ... turns out Zlatan Ibrahimovic's arrogant ways are all for show ... because his Galaxy teammate Sebastian Lletget says the Big Z is a big sweetie, and a GREAT teammate.
Remember it was Zlatan who announced his arrival in L.A. with a full page ad in the L.A. Times that simply said "You're Welcome" ... but when we got Lletget out at LAX, he told us not to believe the hype.
"He's not arrogant," Lletget says. "He's a good teammate."
He went on to gush about Zlatan -- praising him a solid dude behind the scenes.
Not sure if we believe this ... remember, it was Zlatan who dissed U.S. soccer on the streets of L.A. back in '14, and it was Zlatan who once said, "I can't help but laugh at how perfect I am."
If it's a lie ... we choose to believe the lie.