BM'ing and confusion

So I just played against a team that had a Lulu top, one who built rageblade and attack speed hybrid. Essentially early game against our Tryndamere top lane it just destroyed him, by literally just right clicking, and she was one of the most BM people I've ever had the displeasure of ever running into. At one point I went top as jungle Rengar to try and kill her after she just dove our Trynd again, and she exhausted me as well as ulted herself, and by the end of it both of us had one hit and I jumped her with my Q active, hit an E on her, and landed with the Q at the same time and it literally did no damage. I was pretty sure her shield was on CD, but it was the only explanation, so I asked in all chat "wtf did your shield come back up already?" And she ofc just started the typical "wut u mad? salty much? idc I'm just awesome! Git Gud!" And so on and so on.

She did this literally everytime she killed someone for the first half of the game, sadly for her that build she was cheesing with falls off, so late game we being the better team simply coordinated better and she became kind of a none factor. Eventually we won, and in the end game chat me and a few of my friends (yes it was a normal match) all said "git gud" as a reference to her spamming it all game.

She then started making excuses, attacking us for our performances even though we literally all did better then her in the end, and she legitimately asked us "what is your problems?" Ofc it continued as we laughed at her excuses, but she was 100% confused as to why we said something.

So I know responding with fire to fire only makes things more toxic, but we were on a high from our win and it felt so good to beat someone who was talking down to us for so long, but the moral of this little story is that if you BM like a little child don't be surprised when you lose that the people you were harassing harass back. That Lulu wasn't the first, and won't be the last, I just hope more people grow up and expect to be hit by karma (not the champ) when they act like a self-entitled little brat.