Why do people bring up Match History/Rank?

Just got done having a heated discussion with a teammate after the game was over. She claimed that I looked like I was inting (Defended our base against 4 people) while our Jhin wasn't (ran right down midlane into 5 enemies). I was already infuriated because if the Jhin had actually tried we could have came back. Had multiple chances to. Now this lux was telling me I was the bad player. I'll admit I let my temper get the better than me, because there's nothing I hate more than being talked down to. As we're having this argument, the Lux brings up some of my match history (I had some bad games recently). She also brings up that I'm Bronze 5. Why do people do this? You weren't in those games, so you have no idea what happened in those games for them to go so bad (she brought up an 0/7 Cho'Gath game in which literally their mid and jg constantly came top. It was my fault for not playing more passive, but still...) You also have no idea why the person you're talking down to is in bronze to begin with. Hell, YOU'RE in the same division seeing as you just played with that person, so why are you talking trash like "stay bronze kid" when you yourself are bronze. It's infuriating that they bring up something that is completely irrelevant to the current argument. We all have bad games. It happens to the best of us. It doesn't make you a better player for bringing someone else's past mistakes up. Anyways, let me know what you guys think. Do you hate people who do this? Are you one of those people?