Is this behaviour acceptable?

They sound controlling. It isn't normal to shout at someone for, or even care about the amount of gravy on their plate, or their decision to put on a jacket.

Yeah. Thats abnormal behaviour on the relatives part. Jealousy issue maybe?

I'm an adult in my 20s

I'm fed up of my relative, and I don't like them anyway.

I always having to do stuff which "satisfies" them, something stupid happend, I put a good amount of gravy on my plate of food , and they literally shouted at me because I didn't put enough of it on my plate.

If I move and decide to sit somewhere else in the same room, that relative automatically thinks something is wrong with me.

If I feel cold and I'm wearing my jacket, that relative gets really upset and angry with me...like I disrespected them or something.

I haven't done anything wrong to them, I'm not rude...just content.

They always forcing me to do things which I don't want to do

I do everything to please them and I'm still doing something wrong to them.

They're really rude to me and I'm really fed up with them.
Is this acceptable behaviour?