In the video we see:

- Gdragon obviously angry before a concert at seungri for not inviting his hyungs (big bang members) to his birthday party, when seungri knew that the 4 were going to be in the army for the next year, and instead seungri throwing a party, not inviting them, just partying with a bunch of strangers

- TOP talking about how he's worried about seungri, because sometimes the people seungri invites to concerts look shady and they look like they aren't real friends but only hang out with seungri because they want something out of him

- Taeyang talking about how the big bang members left one after another from the shared apartment because seungri would invite girls and play loud music quite often

- TOP talking about how seungri changed and that he is very materialistic and only cares about money, when at the start of big bang he was different and actually cared about music

- YG calling seungri to scold him for holding yet another party without his knowledge, YG said "don't do unnecessary things". (honestly say whatever about yg but even he knew seungri was up to no good and that's probably why he disliked seungri)

GD and his lyrics about seungri's shady friends trying to approach him but gdragon is smarter than that and obviously declined

- big bang members predicting the future, that they'll only be 4

- and some other minor things, like seungri showing a glimpse of a pool party, 

AGAIN DON'T HATE ON BIG BANG OR ANY OTHER YG ARTIST OR EVEN YG, BECAUSE OF SEUNGRI

some thoughts:

- You can actually see that the big bang members did care about seungri especially Gdragon (scolding him) and TOP (giving him real advice) and even Taeyang had a lot of patience with him (moving out after all the other members did)

- You can see that seungri obviously enjoys money and women and parties (nothing wrong with that in itself) but he also wanted to show off

- some comments under the videos said it already and it makes sense, but he probably didn't invite the big bang members to his parties because he wanted all the attention for himself