Even biological sex is not that clear cut - some species of fungus I believe have tens of thousands of sexes. Parrotfish are pretty well known to "transition" depending on the dynamics of the group/harem (e.g. if the male of the harem dies the dominant female will become biologically male). Without the lens of the human heternormative gender/sex binary, it makes more sense to categorise bees into three sexes.
Just because you don't have a PhD in Biosciences doesn't mean you can't use a shred of critical reasoning to understand that the matter may be more nuanced than presented in GCSE Biology. I mean, we all accept in GCSE Chemistry that electrons are little balls flying around a central ball of nucleus - you quickly learn in A-level this is just a simplified model, and the actual reality of the matter is more complex (and in a chemistry degree, you'll learn how much more complex it is...).
At the very least you should be able to take stock of the limitations of your knowledge and not willfully use that ignorance to hurt other people. Being nice and respecting other peoples identities isn't a difficult academic concept, it's something most people learn from disney movies at the age of four.