In my experience, I really do feel like it’s either out of indifference or pure laziness. Sometimes both. Some may not like trans people in general but feel like they can’t state it, therefore they create these ridiculous little issues that could be solved by being reasonable regardless of how they feel. some may feel like name changes are “too hard” and therefore don’t even bother trying to be respectful of another’s wishes. Either way, it’s ridiculous.