Serious question - why is the far right obsessed with gender definitions?

[sekker]

$tevie wrote:
But I think that using "they" for singular has been quite common when gender was unknown or else all-encompassing.

for example: Someone left a note in my mailbox. They said they have my package that was delivered earlier.

If a person wants to use the pool, they have to sign a waiver.

I saw someone walking by and they were wearing a fedora.

etc.

Still confusing nonetheless.