Shoots Down Fight W/ Paul Bros

Not happening, according to Jermell, who tells TMZ Sports the Paul bros ain't on the Charlo bros level right now, but, absolutely no shade here ... 'cause the light-middleweight champ says he's actually a big fan of what they're doing in the sport.

"I f**k with the Paul Brothers."

"I like what they're doing. Let them keep boxing and keep going. They're gaining experience in boxing right now. They're doing what they're supposed to do. They're doing what legacy makers are doing and that's why I feel like the Paul Brothers, they're gonna keep on doing what they doing and making big money in boxing and making money on YouTube."

In fact, Jermell says other fighters could -- and should -- learn from…