We outta start improving this community step by step.

I am sorry but I did LOL irl. The league community is a very passionate community which is why it may seem a little toxic sometimes but it is because people love the game and people want to be good at the game and it is difficult to do. Vayne is easily countered early as she is very squishy. Also yeah, a one trick at anything will be good at the champion, but vayne mains are highly skilled players. If you don't use the ban option to ban vayne out, best thing I can recommend you do playing her early if you are bot is to poke hard and punish her squishiness OR in team fights communicate with your team to focus all cc on her because if not she will roll through people, especially a good vayne. CC chains are important to follow up with on her because it locks a vayne down.. For example a bard ults her and a malphite ults right after bard's ult is done. Following that for example if there was a syndra should follow up with her ulty and that vayne has no chance.

Like I said chain CC. Good luck, hope this helps.