I'm going to get specific here.
I'm not talking about a bullying campaign that's branched out into the digital world, that is what I would class as actual trolling.
I run a blog that talks about the specifics of labour law. A number of posts resonated with a profession that was going through a tough time. As time drew on, what was professional unity devolved into infighting along two lines: accept a new contract, or not and carry on industrial action.
I advocated the new contract. It was the best offer(in my opinion), went from salary with a paycut and increased hours, to effectively an hourly rate with punitive overtime pay(for the employer)
Now, This is where I supposedly got trolled. I was innundated with comments saying that I had "betrayed an entire profession", "I couldn't add up", "I'd never worked as X what the fuck did I know"
In my posts I swear a lot. Instantly I went from an amusing post with some political points that "really hit the man" to "a dirty troll who's foul language betrays a profession"
I just expressed an opinion.
People engaged with me, and I them on twitter. When I didn't change my opinion, I was a troll. When I used high quality sources, I was a shill.
Unless someone doxxes you, (either in public press, or 4chan) you can just turn it off. Twitter/facebook/email can all be erased.
You do not have to respond. They want a response, to re-enforce their own opinion.