Mad because :
1. They can't afford bitcoin.
2. Too late to the trend, they are jelous of peoples who get into the trend long before them so that those peoples earn more than them.
3. They want to make peoples leave bitcoin and chose other digital currency which they have bought with the intention to raise its value, greed are disgusting when are too much that you do anything to get what you want.
4. Etc you can think of.
So don't mind those peoples, only sell your bitcoin or buy it when you see profit.
Yes, we mus do not mind those people who laugh us because of bitcoin. Those bitcoin basher are prejudice of bitcoin because they do not experience the blessing of bitcoin because they are afraid to try new things. Those are the people who do not have confidence to take risk because they are full of negativity in their mind. They also afraid to loose so they do not try new things. Those are the people who will end up regretting when bitcoiner whom they laugh becomes bitcoin millionaires.