Racist remarks don't really fall under salty. Quit trying to downplay what you did. You were both racist and berated your team for the entire game. Mutes existence is not a free pass for you to spew hate or treat your team like a punching bag.
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We consider the "Mute" feature to be a last resort. When a player has to use the "Mute" feature, the damage has already been done. Your experience is already worse, you are already less likely to play another game, and you already don't enjoy League as much as before. The "Mute" feature is a last resort to prevent any further harassment or abuse. Just because a feature like this exists doesn't mean it's OK for players to spew hate speech or be racist or verbally abusive. The vast majority of players in League hate these types of behaviors, and we should respect these players and not tell toxic players it's OK to be dicks just because a "Mute" feature exists.
Mute so you don't have to deal with someone anymore. Report and punish so the next guy doesn't have to deal with them at all.