We preferred it when trolls were things you stuck on the end of your pencil.
The Grammar Nazi.
Traits: They're physically unable to not point out any and every spelling mistake or grammatical error they find on the internet, and are under the impression that such mistakes instantly discredit what the writer was trying to say. Basically, their dicks. (See what we did there?)
How to combat them: Employ a proofreader.
The Shouter.
Traits: They're angry. So, so angry. They're angered by happy people, sad people, other angry people, cats, badgers, themselves, politicians and humus.
How to combat them: Steal their Caps Lock key.
The Hater.
Traits: They don't need a motive, they just move from victim to victim saying not very nice things and making you feel like you've done something to deserve it. Which is nice.
How to combat them: Say the words "haters gonna hate" three times in the mirror every morning.
The Twister.
Traits: They take everything you say out of context, and use it to make you sound like a douche. The tabloid journalists of the trolling world.
How to combat them: Don't say anything. Ever.