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(Image: FACEBOOK)

Angus McCormack claims the private school discriminated against him at the function to celebrate its 133th birthday last Friday.

The openly gay 20-year-old, who was head boy at Girton Grammar School in Bendigo, Australia, arrived in black trousers, a shirt and bow tie and had "toned down" his make-up.

But staff said his outfit did not meet the requirements and he left, claiming to have been thrown out.

The fashion and design student took to Facebook to share his anger.

(Image: FACEBOOK)

He wrote: "I was originally considering rocking a dress and some killer heels! However, I decided to 'tone down' my appearance and be respectful to their wishes.

"My family and I are incredibly hurt by the actions, which have been exercised against me and despite trying to remain my bubbly and confident self, this is eating away at the core of who I am.

"This kind of discrimination against any person regardless of their gender, race, sexual orientation or beliefs is just utterly appalling."

His furious status has been shared more than 6,600 times in just three days.

In a statement, Girton Grammar headmaster Matthew Maruff said he was "deeply saddened" at how McCormack felt about the situation.

He added: "Whilst this situation is regrettable, it is an issue of dress code for occasion and institution, not one of sexual discrimination.

"At no time, past or present, has Angus been discriminated against on grounds of sexuality in any way by Girton Grammar School.

"Angus was informed that his choice of attire was inappropriate for a guest of a member of the official party."