Actually I like it when people frankly correct other people's incorrect opinions. The negativity I'm talking about is more on the line of 'I hate this job, I'm so bored, my family is so stupid, I'm so sick of school' and also comments like 'That kid has the biggest head ever, I bet it makes her sink to the bottom of the pool' or 'seriously, why do fat people keep coming here and buying chips? They should just die.' This is the kind of negativity I see a LOT less of in Christian circles. Atheists may also be more likely to correct people's opinions, being more contrarian, but it's not something I've noticed personally.