Can I get some Red love?(clarify preseason ranked)

So maybe im crazy... But am I wrong to believe that ALTHOUGH the season has officially ended, your wins, your losses(in ranked). Still affect your MMR, and doing well in "pre season" will positively affect you when the season begins and start your preliminary matches...?

Because I just had a lovely 3v6 where the "plat smurf" fed his ass off because he was upset that ezreal stole baron with his ult and the jungler didnt smite it in time and ranted how horrible silver players we are because of it. (never mind the fact 20 seconds earlier I said dont do it ez up in 9seconds). Then after he force fed mid going 1v3/4 ensuring our loss. (we were up over 30 kills and still had over 10 kills on them at the end and over 11kgold) We lost, and the enemy team wasnt going to report the player because its pre season, and it doesnt matter..... Because winning and losing no longer effects your ranked, because thats why RIOT has preliminary matches and resets everything (was there argument).

So am I just crazy? and need to stop playing ranked? I was under impression you could still raise your MMR helping you for next season. This was my first ranked game since season ended, and could very well be my last, toxicity and unchecked players for this ruins the game, and happens far to often to even enjoy it. And the bots are to easy to have fun, so I really don't even know what im doing here anymore.

If someone at RIOT does see this please send me an email so I can send you the replay of this guy, dragged the match on for twenty minutes so he could feed and throw the game, instead of just pushing mid, and amazingly enough NOONE on the team gave him a negative reaction they all muted him. I on the other hand tried to the nicest person in the world to encourage him not to be toxic and finish the fight. Boy did I waste my time.