He never told him not to. Where is your source for this?
He asked why he was kicked, and he was told "Because you were jumping around like an asshat."
If that doesn't automaticly click "don't do that again, that was bad" then you're a dumbass.
It's like a 5 year old grabbing something hot. It hurts, he learned not to do it again, if he does it again, he gets hurt again.
No you shouldn't...? Some hosts have rather unreasonable demands, and common sense would dictate not to follow them (eg. host tells you to spam chat with "I like big ones up my hole"/host tells you not to shoot weapons when playing a zombie game).
It's their server and they have the right to enforce any ridiculous rules as they please, and if you don't want to follow them, get out. If a host told me to do that or I get banned, I certainly wouldn't want to participate in that server.
I don't understand why people join a server and immediately think they don't have to obey the rules set by the host. Just pure idiocy and incomprehension.