I think that it’s sad because, they probably hate on other people to make them feel better about themselves. They need to realize that making other people feel bad about themselves won’t make them a better person.
If you’re dealing with bullying, do NOT be afraid to stand up against them. If it’s in person, stand up for yourself or go to a trusted adult. If it’s online, block and ignore them. Realize that what they say isn’t true, they’re just an empty person behind a screen trying to get attention. Stay strong