Made a Complete Jerk Out of Myself

I wrongfully and sharply suggested in draft that a teammate not pick into , totally unaware that had numbers against her. The teammate politely said they were practicing, but was equally unaware of my ignorance along with the rest of my team. I told them to go practice in bots, even though we were in a normal game. The natural assumption for me was that is trash since I don't see her played hardly ever, let alone against a champ with the second highest ban rate. This post is a personal repentance, but at the same time I wish someone would have enlightened me. I certainly don't want to come off as an cancer to the community as someone suggested.

I want to apologize to the community, and promise to never assume anything when it comes to league again. I would like to admit that I'm somewhat new to LoL but I have put a lot of time into becoming a decent player. An oversight on my part is certainly not unusual.