It's either they were looking for a quick profit, or the investment they made in the first place couldn't be afforded to lose so they were rather fearful about investing it in the first place, especially in an asset that would take say a year or two (which is already short imo) to grow.
If the bull run ever start again do you think it will be massive for small and medium investors. I mean those who start up their Bitcoin holding investment with an amount as low as $100.
Wouldn't say so. Bitcoin may have grown to tens of thousands of dollars in price (and may grow in the future), but it's space for profit was unlike what it was in the beginning. It is nonetheless still profit though so I don't think anyone going to complain about that.
Recommending someone to invest in Bitcoin is some how risky. If the don't have the patience to wait for the bull season to commence the might sell at a loss and but the blame on the introducer.
Any investment is always risky, heck even a quick lookup on crypto investments would say that it's probably riskier than other investments due to its volatility, but it's also this that made it possible to profit big in its cycles. Blaming whoever recommended it to you simply means the person doing the blaming was never meant to invest since they couldn't even do basic research in the first place.