Two McDonald’s staff have been sacked from a restaurant in Melbourne after making offensive comments to a customer.

The two former employees allegedly told mother-of-three Nancy Sarfisis to “go run on a treadmill” and called her “fat.”

Ms Sarfisis visited the Craigieburn McDonald’s in northern Melbourne around 10 times a week, but was frustrated with customer service by the staff so she took to social media.

She posted a video on Facebook with mayonnaise all over her lips, asking the drive-thru staff for some napkins.

Store manager Sonam Dhindsa replied to the video, posting a comment: “Some people just need to stop sitting at home and eating fast food. Maybe then … their brains would actually work. Low life.” Lorie Petraroli, also fired, added: “Go run on a treadmill instead of going through drive-thru (sic)”.

Ms Sarfisis said she was shocked at her treatment.

“It’s just disgusting,” she told Seven News. “I’ve been humiliated, I’ve been bullied.”

McDonald's released a statement saying the company expects employees to treat customers with respect at all times.