It is unlawful to discriminate against people with a protected characteristic: age, disability, religion and belief, gender reassignment, marriage and civil partnership, pregnancy and maternity, race, sex and sexual orientation. UCU opposes unlawful discrimination and will help members who experience it.
Or it may equally be the case that you are being treated badly for no other reason than your manager is a bully, or a colleague has developed a personal grudge.
You can find more details about this on UCU’s website here.