PSA: According to Riot, a teammate can in fact ban your hovered champ and it's not punishable.
I had a teammate in a Normal Draft game ask if he/she could have my role of Jungle. I told them no. So they banned Lee Sin who I was hovering after they responded with a "fuck you then". I filed a Support Ticket and was told that the only punishable offense that I provided with my screenshots was the "fuck you then". So apparently if this player had just banned away my hovered champ and not said anything, it isn't punishable to grief your own teammates by banning their picks. I was told "all players are allowed to ban any champs that they don't want to play against OR with."
cause I just didnt like them on my team or the other team. A couple times people on my team were hovering him but I just hated the playstyle so much that I still banned it. Draft is about strategy and setting up comps you prefer and think will do well. If a player believes the ban is worthy, it should be. Now you cant do it while telling someone off but if I just ban it you just have to be flexible. That's what champ select is about more often than not, flexibility and matchup knowledge.