Oddly curious to what they have to say.
What's acceptable and whats' not? Is it okay to ban a teammate's champion if I decide that nobody I play with is good enough to use "X" champion?
If it's not, what type of offense should that be categorized under?
It is acceptable to ban any champion a player wants to, for any reason. This is one of the "core mechanics" of the game that is required to ensure that there's not "grey area" here (see below):
In any situation in which you have two competing interests/mechanics, there is a requirement that there be clear cut rules as to which one will hold priority. The default will always be mechanic A holds priority over mechanic B. This is the current situation (banning always holds priority over desired pick/picking). If Riot were to start meddling with this priority - let's say they add conditions - it both makes the game harder to learn and master for players, as well as opens the door for a "forced meta", which Riot has said they are against in any and all ways. Even just the condition that you are not allowed to ban a player's selected champ can be abused easily by players who are last pick "hovering" pick/ban champs in an attempt to let the enemy team pick the champ. A condition such as "you are allowed to ban a teammate's champ only when their champ isn't fit for their role" requires Riot to both a) entertain a forced meta and b) trust players to enforce said meta - neither of which will actually happen.
TLDR: Banning always holds priority over picking.
You don't have to justify your bans. Ban whoever you want.
Riot's stance is that anything goes when it comes to banning champions.
You can ban whatever you want, though it may be a jerk move to ban your teammate's hover.
Just be prepared that others might respond with toxicity cos they feel they were jerked.
did someone ban your B5 nidalee support? i dont think that is or should be bannable lul
