A Florida mother is demanding an apology from her son's elementary school after she says the teacher's approach to celebrating her son's birthday was "offensive" and racist.

The incident happened at a Floral Avenue Elementary School in Polk County, near Orlando.

Desarae Prather told CBS Tampa affiliate WTSP the teacher sent her the video of the school birthday party, but she didn't find it funny.  She immediately went to the school's office.

The video showed the teacher singing to the 6-year-old boy: "Happy Birthday to you. You live in the zoo, you look like a monkey, and you smell like one too."

Prather said there's a history of black people being described that way which to her makes it extremely upsetting.

"My skin is boiling. I don't even like racism and to know where we come from and our ancestors and for us to be labeled like that because when they call us monkey they're saying we're ugly we act like monkeys those are remarks I don't like at all," Prather said.

Prather said the song hurt her son's feelings and demanded an apology from the school, immediate disciplinary action and counseling for her child.

The Polk County Public Schools district said it's investigating the incident.

The mother said she plans to transfer her son to another school.