How do we know reporting works?

Let me preface this post by saying that I absolutely love this game but despise probably 40% of the community I have run across. I make sure to report every instance of extreme/repeated toxic behavior, such as hate speech, but have never had confirmation that my reports do anything. I have even had a racial slur slinger claim "I've done this in ever game for a year and I'm still here." This is very, very disheartening if it is even half true.

For instance, in a recent ARAM game, a teammate called another team member a "Jew bitch ass f####t." I immediately reported the player but have not received one of the "Thanks for making our community a better place!" notifications that supposedly exist. I would think this insult is a pretty cut and dry case.

Is there a way to tell if my reports are held in high regard? I know there is a system of discrediting reports from false or frequent reporters - perhaps something I have reported in the past was deemed false and my reports are trash canned? If so, I would love to know when/how this happened and, if so, how to work off the label of "bad reporter."

My apologies if this post sounds whiny - that is not my intention. I am legitimately curious how to tell if my reports are actually making this game I love so dearly a better place to play.

Thanks!