It’s happened to me before with Kwinno, but I wasn’t too worried about it because I know that ghasts don’t appear in the normal world and he was always in chat with me so I always figured out a few seconds after because he would be laughing. I just saw it as good fun. I didn’t know that anyone was bothered by it.
He came up to me as a creeper twice. He didn’t say anything until I had run away from him and then tried to hit him. Then mab teleported to me as an enderman while I was in my melon creeper, and that scared the hell out of me. Limey also teleported to me as a giant slime. Like, the biggest slime possible.