San Francisco Mayor Daniel Lurie skipped a four-hour City Hall hearing on public drug use Thursday to tape a CNN segment at the Ferry Building, drawing criticism from supervisors as Mission District school staff and families described hazardous street conditions near their school. Staff from Marshall Elementary School told supervisors that sidewalks were affected by discarded needles and feces. Students, including some as young as 9, said they felt unsafe traveling to and from school, while parents called for urgent improvements in the neighborhood. Daphne Adam, whose child is in second grade at Marshall, told the hearing that citywide gains were difficult to celebrate while families continued to encounter needles on the way to school. “Celebrating our successes does ring hollow, though, when you are stepping over needles on your way to your kid’s school many, many days a week,” she said. Lurie appeared on CNN with anchor Dana Bash, walking through the Ferry Building as he discussed falling crime rates and fewer overdose deaths. He also acknowledged that San Francisco still has a “drug crisis on our streets.” Board of Supervisors President Rafael Mandelman and Mission District Supervisor Jackie Fielder faulted the mayor for missing the hearing. Fielder called the mayor’s office’s absence from the chambers “unacceptable.” Mandelman said he was unsure Lurie’s absence was “to the benefit of San Franciscans.” The mayor’s office said Friday that it had offered briefings on the hearing’s issues to all supervisors who attended the committee meeting the day before the hearing. The dispute underscored the tension between highlighting citywide progress and addressing persistent street conditions that families say affect their daily lives.