I don't think a-logs really need a reason to hate the lolcows they target, it's more like watching the misery of someone else provides a kind of narcissistic supply to miserable losers, especially if they have a hand in causing it. Being part of a community like the reddit grants these people a sense of power that is otherwise probably entirely lacking. They invest themselves in his misery first, then justify that with hatred. I never really feel bad for Josh, or any cow, but legit if any of them actually manage to turn their lives around even a little bit, I would be legit be happy for the success story.
Now, in this case, getting involved with NAL is going to be bad for Josh fairly quickly, but in this moment, I can be happy for him that he realized his goals.