You'll never see Richard Sherman running his mouth about Dez Bryant ... and vice versa ... so says the Dallas Cowboys receiver who tells TMZ Sports the two have way too much respect for each other to beef.

Bryant was out at Mastro's Steakhouse in Beverly Hills when we asked how he felt about the most famous rivalry in the NFL -- Sherman vs. Crabtree ... the rivalry that led to that infamous post-game rant with Erin Andrews.