I'm not arguing about whether or not this particular instance contained "uncivil comments" (do the mods have the ability there to delete the comments if they are uncivil?)...
But day in day out, on a mass level, it's such a goddamned drag, even if it isn't directed at you, it's energy and emotional bullshit. Every job has it, sometimes it's your boss or shit coworkers... But customer facing is such an awful position for the wages they usually make. Even if it's "good" wages. Even if they don't primarily face the public, but still have to engage in a secondary support role. I can't imagine what it's like to deal with this as a job when you're on the front line with an angry mob coming at you.
Again on this particular case I'm making no judgement, but it IS a stressor, regardless if directed at you, or not.
Especially in a high volume environment that probably has more incoming vectors of commentary/attack/vitriol than just the single comment thread.