TL/DR: I respectfully disagree. It is rude to deny players of new content in Normal queue.
Long Version:
In ranked I can see not wanting a new, un practiced with or versus champ in the mix, but people who ban the new champs in normal draft simply because they don't want to deal with the new champ is unfair to players who are just trying to have fun enjoying new content. You know, fun. The purpose of a game.
By insta-banning a brand new champ, especially from someone on your side hovering it, you are letting your over competitive attitude rob someone of a new experience to enjoy. You don't want your teammate to practice a champ they don't know? Think it'll lower your odds of victory? Go to ranked.
However players are not going to change. There will always be the people who insta-ban new camps because they don't want to deal with changes to the game they've desperately struggled to get a little better at. What needs to change is on Riot's side.
New champions should NOT be put in the Normal Draft ban queue for at least the 1st 24 hours of release, if not more, purely from a business standpoint. (To clarify before people scream at that, yes they should immediately go into the ranked ban queue.) A good portion of people who get hyped about a new champ will go out and buy the on sale champ and skin pack day 1. You know how they're rewarded? With people on their own teams banning away the champ to avoid change for a couple weeks. Having to wait one or two WEEKS to play a champ you buy for 1800RP ($15) (Using Kayn pricing as example.) is an aweful feeling, and not a good incentive to buy new champs going forward.
Hopefully Riot will find a way to make champ release feel exciting and fun again, instead of half the players dreading chamge, and forcing the other half to be denied the new content for awhile.