Darren Rovell thinks Johnny Manziel is washed up.
Johnny Manziel thinks Darren Rovell is a "bitch."
Yep, things are heating up between the ex-NFL star and the business reporter -- and it's all playing out on social media.
Here's how it started ... Rovell posted a tweet on Wednesday comparing 2 Sports Illustrated cover stories from 7 years ago. ... featuring the Alex Rodriguez steroid scandal as well as the "Johnny Football" craze.
Rovell says A-Rod was at "Rock Bottom" back then while Manziel was the "envy of the college football world.