One of the great myths is that you have to put up with negative people online, that you have to 'toughen up', because, well, just because... You don't. Seth Godin wrote a great piece years ago telling you to fire your customers if they're too troublesome, and I've used this strategy in 2 businesses since. It's liberating. Negativity, insults, poorly mannered and poorly behaved people - you really DO NOT have to put up with any of that. Kick them to the curb and move on, because you really do not need those sorts of people anywhere near you or your new business.
Unfortunately, a lot of 'those people' hang out on HN (and the Guardian).