A Democratic Socialists of America member vying to be Los Angeles’ own Zohran Mamdani went off the rails on live radio — lashing out at a reporter while bungling basic questions, including getting her own age wrong. The tense clash erupted during a sit-down with KNX News when mayoral hopeful Rae Huang tangled with veteran City Hall reporter Craig Fiegener — growing increasingly frustrated as he pressed her on key issues such as taxes and policing, according to audio of the exchange obtained by The Post. The fireworks started almost immediately, as Huang hyped the “Overpaid CEO Tax” — a...