Not celeb gossip:
I'm good friends with someone who has gender identity issues (came out as a crossdresser to her wife years ago and years later is now considering the gender identity route) and even I'VE never head of "deadname" - it must be quite a new term. She is well-liked and very sociable but you do get some TV and trans women I've met who are very militant, attention-seeking and almost spoiling for a fight who maybe don't do their cause any favours.
I have even met trans women (post-op) who think they are somehow "superior" to crossdressers - which just makes me sigh with dismay.
One more mature trans woman who ran a help group was on a mission to get everyone she met to consider the gender dysphoria route, (I'm going by what I've been told by my friend).
People who have met my friend have called her, Him, He, simply because they have no idea how to behave - other than that they are friendly and eager-to-please, generally.
Remember, not all of us have experience of gender or sexuality issues - a well-meaning comment isn't usually intended to hurt, go by the person's demeanour, not their words. It could just be ignorance and lack of interaction with certain social circles.
Most people we meet on nights out are amiable and accepting. We have also had experience of gay people being horrible, in a gay pub where you'd expect to feel safe! So, you can't make assumptions about ANYbody.
TL;DR: People are complicated, say the wrong things and come with baggage, but most mean well.
I hate the term Karen too, I've already mentioned why on older threads.