"When I pulled the colander out of my bag and showed it to him and he just went 'no'. He thought it was ridiculous."
But Lachlan says he's not being cheeky or disrespectful.
"It's my religion. I've been a Pastafarian for the past two years and wearing the colander should be allowed.
"I think it's pretty simple – other religions are allowed to wear their headgear, I don't see why I shouldn't be allowed to."
In this respect Lachlan does appear to have the law on his side.
The Church of the Flying Spaghetti Monster is legally recognised as a religion in New Zealand and the Netherlands, where Pastafarian representatives have been authorised to celebrate weddings.
Lachlan has gone to the Human Rights Commission for a ruling on the matter but in the meantime, and in keeping with his religion's relaxed approach to life and rules, says he's accepted his school's decision and will concentrate on other parts of his church's teachings.
"We have a holiday dedicated to two-minute noodles – Ramendan – which is where you eat only two-minute noodles for a day.
"But since the religion isn't too strict I decided I'd go a bit further and did four days of eating two-minute noodles to show my love to his Holy Noodliness."