Aries Spears -- Cracks Michael Sam Gay Joke on ESPN ... 'I Probably Won't Be Back'

Aries Spears says he doesn't expect to return to ESPN after cracking a gay joke about Michael Sam live on "SportsNation."

The comedian was sitting on a panel with Michelle Beadle and Marcellus Wiley when he brought up Sam -- the first openly gay football player in the NFL.

"I went out and got my first Michael Sam jersey," Spears said ... "It's got 15 S's on the back."

Beadle shot him a cold stare. Wiley told him, "You ain't right."