I would not ghost people who I have a relation with or I have some respect of them. Unfortunately sometimes you have to deal with not so nice people too.
If you ask my dad, I am 100% sure he would tell you I have ghosted him. In reality, I told him repeatedly, over the course of years, that if he would not speak to me with at least a base level of civility, I would stop talking to him, and then when I did stop, I ended with, "Because you continue to refuse to speak to me with at least a base level of civility..."
And it's not like I just put up with it for years. Each time, I would go slightly longer without speaking to him. But eventually I would guilt myself into, "But he's your father. You have to try again." But it didn't matter how long the break was. Nothing changed. So I finally realized there was no more good to come of being in touch, told him so, and cut contact.
I imagine a lot of people have this experience with narcissists. And if they see your action as "ghosting," so be it.
"A shift in American family values is fueling estrangement"
When you have people in your life that make false accusations, manipulate, lie, and cannot be reasoned with, ghosting them can be a quality of life improvement.
It is quite a bit different than someone ghosting because they’re bored with someone. The conflict is already out in the open.
But otherwise, I’ve always given a reason. Whether they can accept the reason is up to them.