This all started when the Golden State Warriors faced off against the Los Angeles Clippers and Guard Dhantay Jones bumped Draymond Green at the end of his interview. Draymond Green took it personally and verbally attacked Dhantay Jones, and Doc Rivers stepped. Which is where “Cool Story Glenn” originated.
This is how the T-Shirt looks:

According to Diamond Leung of the Bay Area News Group:
“I approved it,” Green said Friday, the morning after the release of the line of “Cool Story, Glenn” shirts on Athlete Originals that includes three different designs. “A lot of fans kept asking me for it, so the person who runs my store thought that it would be a good idea…
“It’s not for a lack of respect,” Green said. “I respect him. It’s fun. Throughout the course of the season, you find things that’s funny. You have to. It’s just fun. It’s no disrespect.”
The feud continues.