Shaq to Kanye -- 'They Treat Us Like We're Evil'

Shaquille O'Neal -- one of the most beloved people in all of pro sports -- says he's got a lot in common with Kanye West ... saying they're "underrated" and people think they're both evil.

It's all part of a Happy Birthday rap freestyle Shaq made for Kanye's big birthday bash at Staples Center earlier this week ... the video was played on the big screen since Shaq couldn't be there in person.

One of the more interesting lyrics ...

"Kanye ... me and you the same people ... we underrated, they treat us like we evil."

Check out the clip ... it's fun to watch ... but it's not his best work. His greatest freestyle took place in 2008 ...