uh...
I don't really see anything wrong with the host, he was hosting an RP and in an rp you have to roleplay and do what the host says so that the RP can run correctly.
You chose to enter the server and run things your way. That's not exactly how an RP works. All you had to do was leave the server if you disliked what was being done.
If this were a freebuild, I would understand, but this is an RP.
The build quality is irrelevant.
I could understand how he says "were in space" and changed the timescale to 0.8, because he is probably new and didn't know of a better way to reduce the force of gravity.
I'll admit, the ban was a bit spontaneous, and he could have worded it better, but it's his server and his roleplay.