Oh yeah, some awful people on here, and i swear they do it for a reaction. And as has been said, they wouldn't talk to people like this irl.
I posted on a thread earlier where someone was saying they find it odd that occasionally they get a visitor who brings their own snacks and drinks. I said I do because I visit several vegans and they don't provide non-vegan snacks. I have no desire to eat their vegan food, and so I take my own snacks. I also don't want a hot drink with disgusting soy milk, so I take myself a drink.
Cue about half a dozen arsey, snarky remarks from several posters demanding to know why I don't take all the amazing, wonderful vegan snacks on offer, and that I was a fucking idiot, and just how DARE I expect vegans to provide non-vegan food. I was only talking about how nice it would be if the vegans I know would buy a packet of mcvities chocolate biscuits, or some custard creams, as maybe I would like something other than vegan food...
But noooooo, what a bastard I am saying I find it a bit unreasonable that vegans expect special treatment and special food buying, but I am a cunt for expecting the same.
Then along came the predictable bollocks remark.......
'you sound like hard work...' 
The temptation to tell them to go fuck themselves was off the scale.
But I didn't. They're not worth it. 🙄
And I agree with @Callywalls it's often the same names who have to argue and post comments to flame, and wind people up too. Sometimes when someone posts a thread about a certain issue or thing that's bothering them, I think 'the usual 4 or 5 posters with their typical negative, goady remarks will be along soon.' And they never fail to deliver.
Sooooo predictable.