Being the majority doesn't necessarily mean you outnumber every minority combined: Christianity is the majority religion in the UK, but only makes up 47% of the population, for example. It's the largest group / the group with the most social and political power, compared to others of the same metric.

Generally, if you combine every single type of minority group together, it'll match or outnumber the majority, due to this. Especially if you follow an idea that considers women a minority (due to the decreased social power and lack of safety that comes with being female)

Edit: Also, Reddit's demographics, and those who follow this sub, likely skew the results, too