Most people will respect pronouns. My best friend is trans and her fear is people wouldn’t. She’s had zero issues with it.
Americans are oddly respectful. It’s the way we are raised. They may shit talk you behind your back but in person they’ll typically be polite.
We had another co worker who has the same fear. Several people said they’d use her of old pronouns but in the end everyone respect her new pronouns.
They/them is the only one I’ve seen troubles with. I won’t use it because I screw it up. It’s not the way I speak. That’s the only one I’ve seen issues with. As long as someone sticks to he/him or she/her I’ve yet to see an issue in my social circle.