Well, first of all, give them your full attention. Don't interrupt. Use facial expressions and body language to show you're following along. And when it's appropriate, ask relevant questions to show you care about the story.
You should listen attentively and show interest. Maybe nod or make appropriate comments to show you're engaged.
One should firmly tell the person that this kind of story is not acceptable. For example, say 'This is inappropriate. Please don't share such stories.'
You could simply say something like 'Nice to meet you' or 'That's a great name.'
You could just listen attentively and show your interest with nods and smiles.
Just say 'Thank you, I'm glad you enjoyed it!' That's a simple and nice way to go.
You could start by showing interest and maintaining eye contact. Maybe nod or make affirming sounds like 'mm-hmm' to let them know you're engaged.
You could start by following her back if you don't already. Then, you can like some of her recent stories or posts as a friendly gesture.
The teen might first try to communicate their feelings to grandpa. They could say that the nasty story made them uncomfortable and ask if grandpa could tell a more positive or gentle story. If grandpa doesn't listen, the teen could also talk to their parents about it. The parents can then have a conversation with grandpa to make sure he understands that such stories are not suitable for the teen. Another option is for the teen to just ignore the story and try to think of their own positive thoughts to fall asleep, like imagining a beautiful place or a happy event.
Well, a good response could be to offer some positive feedback like, 'Wow, that's so fascinating. Do you think it was fate or just a lucky coincidence?'
One can reply with 'I was just trying to be friendly, my bad'. This shows that you understand their annoyance and are apologetic for oversharing. Sometimes people are in a hurry or not in the mood to listen to someone else's long story, and this response acknowledges that.
First, she needs to recognize her own feelings and not dismiss them. Then, depending on the relationship with the person involved, she can take different actions. If it's a stranger, she can simply walk away. If it's someone she knows well, like a family member or colleague, she can communicate clearly. She might say something like 'I found that story really inappropriate and it made me uncomfortable. Please don't share such things with me in the future.' By being assertive, she can protect her own emotional state.