The Ban system is not right.

So I just went into a Normal Draft game. I know its a normal but this could happen in ranked. I get supp my main role and pick lux. Our Jhin bans lux seeing I chose her. I got mad a bit and in chat I wrote. "Wtf I showed you I want to take lux. He replied "She is not supp". I understand people dont like AP supports because they can steal kills but I enjoy them because they can turn the game around unlike Janna or Thresh (unless they are god like players). But really. can't he just tell me he doesn't like Lux and not ban her like that. I would understand and pick Sona but this way it just gets me mad. I wrote "But I got masterie 5 and almost 6 on her playing mostly lux supp" (85% lux supp the other 15% mid). And he told me "bla bla bla". I could take Sona and play with him but I could see he was a toxic player. I didn't pick a champion and his last comment just really made me wonder why players can ban champions that we sygnalized we want to pick. He saw I was mad and that Iwouldnt pick a champion and said "Ok pick Lux".

I know I could have done better but really the way he did it. Im not new to league. Its my second year playing but I never ran into a player like that.