LD & going to someone & asking them to stop something?

I am going to try to LD. I have done this a few years ago but didn't know anything about it. I did control my dreams a few times when I didn't like what was happening.
I want to know if it is possible to go to someone & ask them to stop being nasty.
Would this work in a lucid dream? I don't want to control them but to try & show that they are being nasty & to show kindness. I have no idea if this would work or if they would know I am there with them. I am very new to all of this & came across this website no long ago.
Any help at would wuld be great. Many thanks in advance :)

It might help you learn to deal with their nastiness. You could ask them to stop in a dream as a practice run. Build up your confidence, so you could then ask them in real life.

Thank you Robot_Butler, I have already asked them quite a few times now. The problem is, he doesn't stop. I just wondered if it were possible to get through to someone in your dream to help them see what they were doing & they could see how it effects me, on another level.
I thought it could be possible to talk to another person in your dream & be able to show how they make you feel. I had the idea in my head it might change the way he thinks. He doesn't believe that dreams can be real & the idea of ludic dreaming is crazy stuff. So I don't know if I could talk & hope he listens in a dream when he doesn't believe in any of this!

I don't believe actions in a dream have any tangible effect on the physical world. Talk to this person directly or contact the appropriate authorities.

Do a search on dream sharing, various members have been able to find each other while dreaming and both be able to recall the dream the following day, regardless of timezone.

Like to control them in real life? Dream sharing? This is something I used to be able to do with my little friend when we were about 4 or 5 years old. I heard the other person has to lucid dream or something along with you to achieve this. I dunno :S