Get Out doesn't make sense. spoilers

The family is keeping their grandfather alive by putting him inside a black person's body as a vessel. And then..........they make him do gardening for them??? Why. He's their grandfather.

Ok--I get that the grandfather likes running and wants to run around. Why TF does he decide to run at night time, in his normal-ass working clothes instead of running clothes, and why does he run straight toward the protagonist, almost colliding with him, other than to make the scene feel scary. Why not just run in the daytime, wearing actual running clothes? It feels like there's no in-movie reason, it only exists to appear scary to the audience.

Similarly, their grandmother is transferred into Georgina, the housemaid, and near the beginning there's a scene where she is pouring tea for everybody in the yard and she accidentally spills some of it. And the family snaps at her rudely, implying they're racist or classist against her and that they view her as a pariah. But she's not "just" a maid, she's their matriarch. Why treat her so aggressively? There's no reason to think the reaction was performative, it seems to be genuine.

These were intended to be unsettling / scary clues that something is wrong here, but in retrospect when you find out what's happening, they just don't make sense. These scenes matter a lot and they have big impacts as you watch the movie and are trying to piece together what's happening. They aren't things that can just be dismissed by saying "you're thinking too hard about it" and it makes me kind of roll my eyes at what otherwise feels like a pretty good movie.