2 STUPID questions.. sorry: Whats wrong with white rice & Carbs?

I missed the memo
I hate Fads so I ignore then..

But lately all I hear is LOW CARB LOW CARB
I freaked out when I saw an add for a smart ones meal that said 'Only 13 grams of carbs' what happened to 'Only 5 grams of fat?'

I totally missed this boat. So someone tell me.. what so bad about Carbs.. what do they do (as sugars) that are so harmful? What is it that is so unhealthy that people are willing to completely exclude them from their diets as much as possible?

or and what is wrong with White rice?

Just curious. I know.. i sound like a idiot, guess I have been living under a rock.