The ex-Nickelodeon child star is trending this weekend over an episode of his pod, 'Good Guys,' that aired earlier this month ... which the internet is just learning about right now. The reason he's getting dragged -- JP, according to some, comes across as a bit of a jerk.

Here's the context ... Josh and his right-hand man, Ben Soffer, are talking to Tana Mongeau -- who brings up Jennette's memoir from last year, in which she addresses some childhood trauma she went through at the hands of her family and Nickelodeon execs back in the day.

Tana praises Jennette for speaking her truth -- something Josh/Ben say they also tried to do by having her on as their first guest in August ... in an episode that was never released.

Josh and Ben are giving themselves pats on the back for being "good guys" and nixing the episode after Jennette apparently asked them to (unclear why). However, after some time passed, Josh says he reached out to her again in hopes of getting her back on for a redo.

He says it seemed like she'd inexplicably blocked him -- after which, he says he felt like a little quid pro quo was in order since they did her a solid. Twitter doesn't agree, though.

You can go through the "Josh Peck" trend for yourself to see how people are tearing into the guy -- but bottom line ... they feel like he sounds entitled and completely insensitive here.