To me, people getting offended/angry (on both sides of the debate) is a bit over-the-top, as usually there is no offence intended.
However (and I guess I'm a big hippy behind my façade), it makes me feel good to think that everyone is included and is not
unintentionally ostracised. Going about your daily life and constantly being made to feel "abnormal" by being (unintentionally) excluded in casual conversation/phrases just because "it's what people have always said" can't be nice, even if people don't really mean it - it's still there.
Whilst a little bit of thought and a little bit of an attempt at being more inclusive might seem daft now, I can see how it could affect people in the long-term if they're excluded like that throughout their lives. But once it becomes more commonplace you likely won't need to "think before saying" anymore, and we'll be using the more inclusive terms "normally".
And no one is asking you to change how you refer to your personal relationships (people you know) - obviously you call them however your relationship has been built. This was talking about how to address people in general - people you don't know - in a way which can be more inclusive with maybe just a little effort for now, but really it's not much.
I won't get offended/angry if people make an assumption when they mean no malice, maybe just slightly disappointed
. A request like this really shouldn't consume as much energy/debate as it does. Surely a small change to make others feel better (at no real detriment to yourself) should make people think "Yeah, why not", rather than start the defensive? But then I can also understand the defensive reaction when there are over-the-top accusations. So maybe we all need to calm down? Peace and love.