Cowboys and Indians outfits have been banned from fancy dress parties by 'snowflake' university students.
Mexican-style sombreros have also fallen foul of the politically-correct rules, which student leaders say threatens people's 'safe space'.
Among the other costume ideas hit by the edict are dressing up as 'chavs', priests and nuns or IS bombers.
However, the 'fancy dress guidelines' approve of doctors and nurses, Ancient Greeks, Romans, cave people and aliens.
The sniffy commandment was made by the student union at the University of Kent, which claims to speak for 20,000 students at the campus in Canterbury.
It says 'dressing up as a particular race, culture or stereotype is offensive' and will not be tolerated.
But the proposals were ridiculed yesterday. Rob Lyndhurst, a 33-year-old father of two from Canterbury, said: 'To think these people are supposed to be among the brightest young people in Britain.
'I've got two young boys and they love to play cowboys and Indians, just like I did when I was a lad.
'There's absolutely no harm in it, and I'm sure my boys don't feel their space is threatened.'
On social media, Markryan911 wrote: 'The world has gone mad! You can't do/say anything any more without someone getting offended. I have black/white/straight/gay/Catholic/Muslim friends and I take the **** out of them all equally.
'I'm not a racist, I just like to have a laugh and crack a joke. And if someone tells me I can't dance because I'm white, or I like little boys because I'm Catholic, I certainly don't take offence, I just laugh because it's a JOKE.'
Brownnigel637 wrote: 'If these students need 'safe places' because of their fragile mental state, then is university really the best place for them?
'I wonder where exactly these 'safe places' are? Locked in their bedrooms hiding under their covers?' The union said: 'We empower students to be creative, whilst also ensuring all students feel welcome and safe.
'Students' groups are free to engage in fancy dress whilst ensuring they abide by the Fancy Dress Guidelines which include being offensive, discriminatory and prejudice to an individual's race, gender, disability or sexual orientation or based on stereotypes.'
Also banned by the union are dressing up as celebrities known for their 'sexual misconduct or abuse of power' such as Harvey Weinstein or Jimmy Savile.
Outfits with 'historical or religious themes' including Crusaders, Israeli soldiers, IS bombers and the Prophet Mohammed.
The union added: 'Fancy Dress themes should also not be centred around political group stereotypes or the stereotypes of different levels of perceived class in the means to diminish their worth or validity.
'This again would promote an unsafe and exclusive campus to which we do not tolerate.'
It is not the first time the Kent University students union has caused controversy.
Recently it accused the Tokyo Tea Rooms in Canterbury of 'cultural appropriation' after the bar used white women dressed as geisha girls to promote its opening night.
Matt Goodwin, of Kent Union, said the fancy dress policy was a 'draft proposal', adding: 'We will be consulting with our executive groups to gain further feedback.'
This article has been adapted from its original source.
© Associated Newspapers Ltd.