Keith was already trembling from suppressed rage before Anderson even opened his mouth. His hatred for Andy was blindingly obvious. Everything he hated was put together to form the man named Anderson and whenever he sees him, the urge to plant his fist to his face just keeps increasing.
When Andy left two years ago, the happiest person was Keith. For the first time, he didn't complain about Andy running away from work. In fact, he saw him leaving that night with Oliver but chose not to stop them or interfere.
Ever since then, Keith began to receive the attention and praise that he deserved. There was no more Anderson to annoy him or to take people's attention away from him and Keith felt all the happiness he was supposed to feel in his entire lifetime.