https://www.bbc.co.uk/news/articles/c933ky0nknxko
It's an anomaly. A throwback to the 80s. Inconsistent compared with other events.
The PM should know better than using "discrimination" in this context as it minimises the situations of people who truly ARE being discriminated against because of their sex, race, age or other protected characteristics.
Wanting to have a pint at the game is not a protected characteristic.