Not an intentional expression, no. If I say something out of habit without thinking, that's out of affect, not intent. If I then double down on that habit when asked about it, it's an intentional expression.
Maybe I came across too strongly in my first comment, but it was really just meant to be a comment on how "they" is more convenient on top of being more inclusive as a suggestion, not as an attack. I think it's better to use it for two otherwise unrelated reasons, and put forth the one not hinging on ideology.
I am confused, yes. You'd either have to be stubborn about not changing habits or so opposed to inclusiveness that you'd rather write something longer to intentionally exclude. I didn't want to assume either and just chalked it up to habit and wanted to suggest an alternative.