I also experienced that, to the point that I did not want to discuss the topic with people who always criticize bitcoin. I think in the near future they will realize how bitcoin is something that is not bad. we just wait and prove it
At some point I want to prove to them that there are wrong about what they think bitcoin is like saying people are crazy and foolish that they invest in bitcoin. But in some point its useless to prove it to them if they are closed minded about it because no matter how you introduce and state the benefit that bitcoin has if they choose not to believe and believe that it doesn't exist then there is no point in proving it to them you just going to waste your time and effort to them. But will see and prove that bitcoin is legit.