Not really a good example. A more apt example is if these people were getting angry that the character creator allowed a player to create a woman, or a person of colour. The game offering you a choice of pronouns is not asking you for a political opinion, it's literally just an option to create a type of character that these people don't think should exist.
And that's the crux of it, they aren't angry about pronouns, they're angry about trans and non-binary people becoming normalised.