This meme originates from the 2019 blockbuster film 'Avengers: Endgame' during the climactic final battle. Scarlet Witch (Wanda Maximoff) confronts a past version of Thanos, telling him 'You took everything from me,' to which Thanos coldly replies, 'I don't even know who you are.' This dismissive response became an instant internet classic, used to mock people who hold grudges or have deep-seated issues with someone who doesn't even notice their existence. It perfectly captures the energy of a one-sided rivalry or a situation where one party is completely irrelevant to the other, making it a staple for social media 'burns'.