Is it ok?

No its not okay to be rude to other people. If you are rude you'd just get on their level and be as bad as they are

Depends if you have a reason. If you're being an asshole for no reason, then no. You'll become disliked incredibly quickly and start whining that people don't like you.

It's a pretty weird question to ask I suppose. I mean what do you think, should you be mean to others? Perhaps it's just the motive of it?

Well depends on your definition of okay. Murder could be okay depending on how you define it.

I mean i dont think so bro. You affect other peoples emotions then they affect other peoples emotions and becomes a chain of rude people. Just be nice its way better and cooler