Biden didn't do nothing. He stated firm support for Israel, to the point of declaring himself a Zionist, he sent billions of dollars in arms and aid to Israel, and the US under his leadership vetoed numerous UN resolutions calling for a ceasefire, as well as witheld funding to Palestinian relief organizations.
He got the nickname "Genocide Joe" because of how enthusiastic he almost seemed to be about it. Utter disregard and contempt for Palestinian lives is one area where very little daylight exists between Biden and Trump. Even Kamala Harris didn't deviate from that norm.
Biden also put sanctions on extremist Israeli settlers who were committing violence against Palestinians in the West Bank and restored hundreds of millions of aid for Palestinians that had been cut by the first Trump Administration.
He got the nickname "Genocide Joe" because of how enthusiastic he almost seemed to be about it. Utter disregard and contempt for Palestinian lives is one area where very little daylight exists between Biden and Trump. Even Kamala Harris didn't deviate from that norm.