There's nothing that we can actually do to change such mindsets. So many people after they loss so much to cryptocurrency or those many shit coins fluncting the market, they classify all cryptocurrency including BTC as a Ponzi scheme. They don't bother to find out why they lost in first place which was due to their ignorance.

Some of them feels that when they invest in bitcoin they get rich quick, but unfortunately the market goes in a dip, they get scared and frustrated after seeing the value of their coins reduced to half.

There are so many arguments against bitcoin out there, but it's best to ignore them totally because it doesn't count against the countless numbers of life bitcoin has been able to change for good. Those who saw a true potential in it.