Men who have sex with other men should not face any additional restrictions when it comes donating blood. There should be no ban based on the gender of a person someone had sex with unless they've contracted an infection.
You may be interested in these active petitions
In the response to Covid-19, many gay men could have been asked to donate plasma in order to assist with research. However, many would have found out they're excluded simply because of their sexual orientation - this is 21st century discrimination.
Individuals should be allowed to give blood regardless of who they've had sex with and should just be tested instead to ensure it's safe.