A few months back, when BTC dumped to nearly $3200 (or it is $3800) at the beginning of the corona outbreak, a guy from my local who is now living in UK had posted in his facebook that "This is the end of bitcoin. I knew it has to be someday, there it is." I had nothing to say other than asking him to do his homework before doing such speculation. Well, I just have remembered that post and spent a few minutes to find that post and poked him the screenshot of
1 BTC equals to $16602. Guess his feeling now

While I admit that "I told you so" in these type of situations can feel good, BTC going to 16,000+ won't change his opinion or feeling about BTC as people like that will say that "BTC went already to 20k and then dumped so it will do it again", or "it is just pump and dump scheme" or something along those lines. You know the saying, "You cannot reason people out of positions they didn't reason themselves into" and this applies here as well. For them BTC price is pretty much irrelevant and they will always find some excuse. At least that was my experience.
For me, it's a complete waste of time and arguing with those doomsayers is like playing a chess with a pidgeon; sooner or later it will knock all the pieces, shit on the board and strut around like he won anyway. I won't say I didn't make that mistake and argued in the past ( I am active on one IT forum) but I learned my lesson eventually.