The fire commissioner’s son quit the Emergency Medical Service Monday after he was accused of accused of sending racist and offensive tweets.  Joseph Cassano, 23, son of FDNY head Salvatore Cassano, stepped down after less than three months on the job as an emergency medical technician.

His high-ranking father — who spent the morning at a funeral for a retired EMS worker — issued a stern but loving statement as his son’s dream of rising through the EMS ranks to become a firefighter went up in smoke.

“I am extremely disappointed in the comments posted online by my son Joseph, which do not reflect the values — including a respect for all people — that are held by me, my family and the FDNY,” said Commissioner Cassano, a Vietnam vet who joined the FDNY in the 1970s.

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