Seth Rollins says Brock Lesnar is SELFISH and everyone is sick of him ... and 'cause of that, NOBODY wants him in WWE.
TMZ Sports talked to Rollins -- who's fighting Lesnar for the WWE Universal Championship at WrestleMania 35 -- in NYC Friday night ... and there is absolutely ZERO love between the 2 Superstars.
"He's not in it for anybody but himself. So, Brock Lesnar, he will tell you to your face that he is in this industry, he's in any industry, for himself to make his own money,"
"That's not what I'm about.