Jon Jones is "soft as baby sh*t" ... so says Corey Anderson, the guy who claims he's living rent-free in Bones head.
There's zero love between the fighters ... in fact, Anderson -- the #7th ranked UFC light heavyweight -- recently confronted Jon at an autograph signing near Corey's gym in NJ.
Anderson told TMZ Sports his version of what went down ... and had some, lets say, not nice things to say about Jones.
"You made yourself look like you just sensitive, bro. You soft body. You soft like Charmin.