There could be several reasons. His stories might be boring, or perhaps they contain spoilers for something you're looking forward to experiencing on your own. Also, he might have a history of spreading harmful or unethical ideas in his stories.
Yes, if you find that his stories make you feel uncomfortable or unproductive. Just don't watch them.
Maybe his stories are full of negative things like complaining all the time. It can bring bad mood.
Probably not. If you don't like him, his stories may not be appealing to you, and it might just waste your time.
Because it can be really painful. Seeing their new life or things they do without you might reopen old wounds and make you feel sad or jealous all over again.
You'll probably save some time. You can use that time to do other things you enjoy, like reading a book or going for a walk.
Because they can frighten people, especially children. Scary stories might cause nightmares or make people feel uneasy.
Could be that the quality is poor, or the content doesn't match your interests. Sometimes the storytelling style might not click with you either.
It depends on your interests. If you like the genre or have heard good things about it, then give it a shot.
Well, it could be that the characters are not well-developed or the art style doesn't appeal to you. Also, the story might lack depth or originality.
Well, consider what kind of person he is. If he often shares positive, interesting or useful things, it might be worth watching. But if his stories are usually full of drama or negative stuff that you don't like, then you probably shouldn't.