Somehow we tend to catch everything negative more easily than something more positive. It just takes one negative thought to ruin the day. Or at least it takes a lot of positive ones to even make it decent again.
Why are we so inclined to catch that negativity? Is it something we learn or is it a survival instinct?
Any way I believe it can also be unlearned. Or at least we can learn to overcome it. It's just one more habit.
The thing is positive things tend to be momentary, the pass fast. Whereas negative ones somehow stick around. We start to loathe in them. Overanalyze their causes and inpact. And while digging we end up bringing all the old bad thing up too.
Identifying negativity and realizing it's not that bad is the key. Instead of feeling like one negative thought is worth -100 happines where as one positive is only worth +1 they should be treated equal. One positive thing can counter one negative one.
Just accept the negativity, but don't drown in it. Let it go and start looking for something that can bring you back to the positive side.