Why can't people mind their business?

I was watching on YouTube a travel vlog of a Korean woman visiting India eating fried chicken and had her sisters face blurred in the video. Several Hindu idiots commented in the video asking if she was Muslim to cover his sister's face and offended by her eating 'non-veg' on camera in India and told her to eat less meat. Seriously, who do they think they are, how thick they can be.