are you allowed to do ban someone's declared champion?

i Always ban {{champion:157}} and sometimes people on my team want him but then i ban him and they get all mad calling me RE tard and other things, just wanna know if its allowed or if i can get banned by it?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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