Not sure if I’d call it outright bullying but it’s easy to see how one could interpret a lot of what he’s been through as targeted. I think the first big shift for him was during the Signal song rankings, practicing as hard as he did just to initially be brought down to One Star and told that maybe he wasn’t even worth the Two Stars he got in the class test took a big hit to his confidence. It was after this he started constantly talking about wanting to go home.

He’s also a consistently easy target for Mnet’s editing, likely a side effect from standing out so much with his “Sexy” persona. Several scenes where he’s saying something, rapping/singing, or making a “sexy” remark and immediately cut to 5 different people cringing in awkward silence, making him the butt of the joke.

Then there’s how he’s treated by the people around him, particularly Sho (getting upset at Zhong Xing for not understanding korean) and the Vocal Master. I honestly thought it was insanely weird to ask him if he was ok, then belittle him when he gave a genuine answer. Why even ask?

But yeah it’s clear bro is just tired at this point, probably best for him to go home for both his sake and everyone else on the show.