Magic Johnson -- Don't Be a Crybaby, Kanye ... Friends Can't Always Win

Memo to Kanye West from Magic Johnson: Quit whining at award shows -- it's NOT always about your friends taking home EVERY trophy!

Magic was out in NYC today when we asked him about Kanye dissing Beck's Grammy win for Best Album -- and he dished out some sound advice ... which we're guessing Yeezy will totally ignore.

Still, MJ added ... Kanye's basically a "good guy" who just flies off at the mouth sometimes.

The NBA legend also sounded off about the Lakers' celeb fans possibly jumping ship.

Check out the vid. Unlike Kanye ... nothing rattles the Magic man.