The students at Gateway High School were apparently using the word in the classroom.
Christopher Conti said his son heard about the incident from other students.
"He was a little disturbed but I think the consensus among many students is that this isn’t surprising," Conti said.
“The substitute teacher was reprimanding students in the classroom who were using the derogatory word. The teacher also began a conversation with the class on how the 'word' is unacceptable and will not be tolerated," the response said.
While he's thankful for the response, Conti said he still has concerns.
"We get communication in real time about lots of other things in the school district that are far less significant," he said.
The substitute teacher in question was immediately removed from the classroom and will not be back in the district, according to the superintendent.
"If it was significant enough for the teacher to be immediately removed from the classroom, and that students decided they wanted to communicate it to one another while class was going on, it probably should have been disclosed to the parents," Conti said.