This , I was thinking why someone hasn't brought it up yet. I also saw that clip 2 days ago, and the reaction on Suga's face was very uncomfortable. Sometimes, I feel Suga's face gives out, and he falls out of this pretense stuff. He is visibly not close with Tae and Jk. More so with Tae. Though there are a lot of ships on YouTube, it's either he acts silly which is easy coz everyone will think he is goofy, or he stays numb.
I also think they are allowed to talk on certain topics, and they repeat only those. Like the text message moment between them in 2018, the mandu fight, the copy thing, how they cried in 2018 at an awards show(which is so sus, they were balling their eyes out), etc. Its like there were not any other moments between them.
Tae also acts like Suga, either very silly, flirty funny or insufferable quiet. I notice these two when I watch run bts or bangtan bomb. They both slip out of their personas easily.
On the other hand, J-hope never went out of character, followed closely by Jin and Jimin. These 3 stick to their character profiles to the T.
RM is cleverly himself and also not. He pushes ideas to the viewers. Like he will continuously praise Jimin being the nicest guy, or JK being superhuman. These are not fan's words, he subtly feeds these things while filming these shows. Jk just follows lead, and does what the older members do or stay quiet.