I had a questionable debate about the outcome of the match after game.

So I had this game which really puzzled me.

Our jungler and toplaner were a duo, consisting of Teemo and Amumu. They had a result of 22/17/19, and 9/20/10 and I was 9/9/9 with leblanc. I demanded a group-up since our botlane literally was on fire, carrying the game with 13/16/28, and 23/10/19. But they refused, constantly trying to duel enemies near their jungle buffs (amumu was even trying to duel a full item jax in his base) or straight out getting caught out. We eventually lost after teemo getting caught out and dying for the 20th time and being forced a 3v5.

So, after the game as a lot of toxic players do, they tried to invite me, After a load of "trash player", "omg he is typing so hard XDD" over the voice comms. I agreed if it is only a debate of what happened in the game. (And I want your opinions on this.)

One of the main argument points that I did half the damage as teemo. Thus not contributing to the game. I claimed that since the enemy consisted of Jax, Swain, and Twitch that can heal off the shroom damages, the damage dealt does not change the outcome of the game, thus meaningless.

Another part of the argument is because im "bad". (Although I find it a hard experience, being called "bad" by a person who was in bronze for 2 years and never even went to gold.) I asked why I am bad. They answered, because I have low contribution and bad positioning. I argued due to the following points.

1. It was legit a 3v5. All fights over the 30 min mark was like a script repeating itself. Teemo gets caught out, Amumu tries to go after a shaco and dies across the map. Us 3 have to deal a shen, Jax, guarding a full item twitch with GA.
2. There is no way Leblanc can use W to travel half the map. That is broken.
3. Leblanc is a assassin that actually needs to go near a enemy to deal maximum damage. Thus a faltering line is not the ideal fight for her to actually kill a enemy. There is no way, a Leblanc can turn around a 3v5 by just "positioning". That is pure bogus.
4. Our prime time was before the 30 min mark. Leblanc cannot kill a Twitch with copious amount of lifesteal and a GA. We need to win before this even happened. But it never came true since the duo was constanting trying to duke it out near the enemy buffs and ignored the group up call.

After I made the statements, the person was trying to worm away why it was a 3v5 in the first place and made pointless bickering about how "bad" I am and have to admit it So I just cut off the call.

But anyway back to the subject, is DAMAGE regarded a more stronger facet of the game rather than actually coordinating? Or am I making a mistake here since i am "bad"?