I thought PBE was supposed to filter toxicity ?

So I've decided to join a 5v5 normal game in PBE to try out ryze. Champion select goes well, everyone picks their lanes, and we proceed into the game. I've fed first blood against Draven mid, and after Draven getting ganked a few times by Skarner even though he did not die, he decided to write in all chat that we suck. I swiped that off, and continued to play the game. Afterwards, when I was feeding hard even though not intentionally, our Fiora and Lucian started flaming me and saying that i'm bronze, that they are gonna report me for feeding, etc... , and she kept pointing out my score and how bad it is. also enemy Jax got a bit ahead of himself and kept asking when we would ff and after the game ended he said in lobby gg ez. So the only thing that was on my mind the whole game was:"Isn't PBE supposed to be a friendly beta-testing environment?" Honestly I know that /mute all exists but I am playing in PBE to test out my champion along with my team mates and hopefully get tips too on how to play him better and pick fun champion picks that work together, But to think people would go that low in a PBE Match to the point where they want to report me for feeding and start verbally abusing me? This whole post is just my point of view on the current state of the PBE environment, and how I was disappointed.