There are almost many people who knew about Bitcoin long ago but they could not imagine that the price of Bitcoin would increase so much and become a popular currency. So they are disappointed and they often talk negatively about Bitcoin. So it is better to always keep your distance from those people.
Considering the awareness that bitcoin has created yet most people still find it hard to trust bitcoin. and yes, anyone who's finding it hard to build trust in bitcoin need to be left alone but he shouldn't try to poison the heart of those that are interested to go into bitcoin investment. Well even if it is because they didn't invest in bitcoin during the early phase or could not imagine to see the price skyrocketing, yet that shouldn't be a reason why they will keep talking negatively about bitcoin, moreover this is going to be so unwise of them if they choose to talk bad about bitcoin instead of taking advantage, I wonder how long they will continue doing this.