NFL's Ryan Russell On Jon Gruden

Ryan Russell, an openly bisexual NFL free agent, tells TMZ Sports he was sickened by Jon Gruden's racist and homophobic comments ... and the incident serves as proof the NFL has much work left to accomplish.

"I was deeply upset, shocked, appalled even that a leader of an organization, a leader of young men, football culture in general, would have so many negative, derogatory, hateful really, discriminatory things to say about so many different kinds of people," Russell says.

29-year-old Russell -- a 5th round draft pick of the Cowboys in 2015 -- has an interesting perspective. The DE announced he was bisexual in mid-2019.

So, despite players like Carl Nassib and Russ being open about their…