It's not at all an "older-younger brother dynamic" and Vinnie don't want to teach anything to MC. When Vinnie was a DIK, he was always competing with Tommy to see who was the "alpha male" of the group. He won that competition the moment Tommy had to go to him to get weed, something that Tommy didn't want to do (just look the smile of Vinnie in that scene), and probably before, by getting Quinn. Now, he's competing with MC. What Vinnie is saying in that scene is "Even if I don't live here anymore, I'm the top dog here, not you. I mark my territory by thrashing your things, that were mine, and you can't do shit about it". Tommy sees it clearly.
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Wow. What a place stag Vinny is. He throws some books on the floor. Well, if that's not gay. My MC wouldn't mind if Vinny fucked Chad, Troy and maybe Nick in the ass.
Vinny is no longer in college, so it's not about the alpha male bickering in the DIK pack, because none of the DIKs can decide whether or not Vinny can be accepted back into college.
I guess the "older-student-brother dynamic" exists. Tommy is probably the reason Vinny left. Once a DIK, always a DIK, DIKs for life. Rusty and Nick are still with Vinny too, we've known that since EP2. What are the DIKs? A family, brothers. What if the DIK brother Vinny wants to teach his younger DIK brother MC that Tommy is not good for the DIK family and tested the MC?
DIK: The MC hits Vinny and Vinny says that biting dogs need to be taught to behave.
NEUTRAL: Vinny says that barking dogs don't bite, which is absolute nonsense. But crucially, Vinny also says the MC should be more diplomatic.
CHICK: Vinny tells the MC that life doesn't work without fighting.
What Vinny says looks a lot like a lecture to me. We should also not forget what Nick said that Vinny split the DIKs and half liked Vinny and the other half did not. So Nick was saying that a lot of things got better with Vinny's departure. A lot, but not everything. The Vice President is still a loser who prefers to bury his head in the sand when problems arise instead of finding a solution to the problem.
Back to your alpha male. What are the most dangerous alpha males? Definitely not Vinny or Tommy. And why? Because they think they are alpha males and flaunt it. Vinny, on the other hand, has realized that the MC is a dangerous alpha male. The MC can when he wants to, does when he has to, and doesn't even know he's an alpha male. Guess why Zoey gets involved when the MC is badgering Oskar? Zoey is probably the only one who knows from high school how dangerous the MC can be. Vinny feels threatened by the MC because he can't size him up.
Also, I don't want my MC to be the top stag. Stags are eaten by predators.