Thats possible, BTC for this type of people are garbage mainly because they think bitcoin will provide instant wealth not realizing that bitcoin is not a overnight thing. Bitcoin market is known to be very volatile thus, we cant guarantee profits right away, it may take days or weeks. I think they just need to fully understand bitcoin and how the market works for them not to panic and think BTC as scam or garbage.
I don't know what really happened to him, but if I look at the whole, I think you are right, there is a feeling of disappointment or something he knows less about bitcoin.