Stephen Jackson just ripped Darryl Strawberry for saying weed is a gateway drug ... blasting the ex-MLB superstar as a "cokehead" who's "weak-minded."
ICYMI ... Strawberry told TMZ Sports earlier this week that marijuana is SUPER dangerous and is "just the beginning" of the path to way more serious drugs.
Enter Jackson ... a staunch marijuana advocate who heard the comments -- and just had to tear into the former outfielder for making the bold claim.
"You a whole cokehead out here, bruh," Jackson says.
"Asking you for advice about weed is like asking somebody who went broke on how to stay rich.