We obviously disagree on what amounts to effort, if I am introduced to someone named " Delores" it takes no effort for me to refer to them

as she or her than it would he or him. It would take me effort to go through "
oh hang on Delores is a badly dressed man, he's one of these trans-women so I need to call them he and not she". I hold that the default of most people is to simply use whatever the other person wants, like we do with names and nicknames.
If you want me to go further and address something I didn't initially i.e. the use of "they" as a new(ish) pronoun to go alongside "he" and "she" then I would agree that takes more effort. I freely admit I have found it a tad awkward when it has come up in real life. But I can't see any reason why not to put in a bit of effort in to make someone feel welcome and included, I have to have a strong reason to make me want to be rude to someone. My adoption of "they" has been helped by fiction, I often discuss Dr Who with people and we can no longer refer to the Dr as "he" or "she" outside of
specific incarnations so using "they" has been "
forced " on me.
And of course the topic of this thread is
he or
she not they.