I think different bullies tend to target different people.
I spent my teens and 20s very insecure. My 30s have been different. I have been much more confident. I have had to deal with people trying to chip away at me both times.
The main difference has been, that when I am confident and challenge them, they tend to pack it in.
In a job I had, my boss brought me into the company because of my experience. He had full confidence in me and had me in to run the department. The more successful I got, the worse 2 particular women got. Slight digs at first that I pretended to not understand or would say 'I know you didnt mean it this way but that came across as rude'. Then they escalated it by saying I was sleeping with my boss, thats why he employed me. At team meeting one made a comment under her breath about how I would suck my bosses cock to get him to agree with me. So I drew public attention to it. I asked her to repeat herself, because plenty of use heard and she should let everyone else into her opinion. I also told her, I was fully aware of the rumours she was spreading and maybe now would be a good time to squash them. She shut her mouth and left me alone
In my 20s I would have left the meeting and cried. But this made people like me more. I think it's because people felt I was genuine and I do think ultimately people look bei g around confident people. People likes that I stood up for myself and put a bully in their place.
In my job now, I am a director. On my first day a senior director asked me to look at a report, my predecessor did. Turns out this senior director is a shit and it was his work he was palming off. People kept telling me I couldnt tell him no now i had said i would look at it. Apparantly he likes to yell and embarrass people who tell him no.
I said no to him over 3 different things this week. He accepted everyone of them. Because I was firm and gave good reasons and gave no room for argument.
He is a bully. He bullies people into doing his work. Its clear its not working on me. So he didnt bother. Again people seem to like me more. It impresses them that the office bully didnt get away with it. It make people want to know you, get to know how you did it.
Confidence draws alot of people in. But bullies can still target you.