Stealing roles

Why is it that i want a role and claim it in blind somebody who joins later immediately claims jungle and insta locks after i lock. Then he proceeds to say he claimed first regardless of what the entire team says. This happened like 5 minutes ago and i eventually left because he just stole all the jungle went bot because the jhin was by himself in lane and farmed. He made me so tilted i eventually left the team so he would lose in spite.
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