If they don't want to be called stupid then they should start learning bitcoin from the basics before saying it's expensive.
Because after all those who say it's expensive only see from the outside but don't want to get to know more about what bitcoin is and I think stupid words are also concrete in this case because they talk but don't understand what they are talking about.
They are only focused on the value they have and how to think about how to profit in a short time which is impossible with the current value, therefore they consider bitcoin too expensive. But if they already know how bitcoin works including by collecting (buying) then they will not talk carelessly because they realize that saying bitcoin is expensive is a mistake.
There continues to be value in being humble.. and surely none of us really know if bitcoin is cheap or expensive, and surely there are some possible scenarios in which bitcoin never gets cheaper than it currently is, so surely any no coiners or low coiners are not prepared for the bitcoin price to go up, especially if they don't have any bitcoin.
Another thing is that it can take 4-10 years or more to just establish a meaningful bitcoin position and/or to spend time learning about bitcoin can take a decently long time, even for people who are quite smart.
That can be true but in the end in this condition we must be aware, especially by looking at your statement where it takes a long time to build a position in bitcoin to be fully confident, so in the end the initial conclusions about expensive or cheap bitcoin should not apply because we are still in the introduction to bitcoin.
So it will not be very suitable if we have only been in bitcoin for a few days / a few months or the rough term is just exploring the feet in bitcoin already thinks that this is too expensive to buy because in the end when we realize the understanding to continue to learn bitcoin and when we know the risks that will be faced then of course the assumption of expensive or cheap bitcoin cannot be pinned because we are just here. Just because talking about the value now and compared to 10 years or 15 years ago when bitcoin was just created it became a thing that was not too logical for me because the comparison and process was clearly very different.
On an ongoing basis, there are new people coming to bitcoin and just starting to learn about bitcoin, and many of us know that it is quite hard to know about bitcoin if we are not actively buying it, and such buying and building a bitcoin position helps to inspire us to learn more about bitcoin. There are also a decently large number of people who have heard about bitcoin or they know the word bitcoin, but they either do not know anything about bitcoin or alternatively they have been taught (or learned) wrong information, which might be even more dangerous for folks to think that they know what something is (bitcoin) and actually do not know as much as they believe that they know.
We cannot make it seem as if this is easy because even though now learning about bitcoin is still fairly much easier when looking for information but of course we also as much as possible should be able to filter all learning so that we can find out which information is really useful and which information can be misleading. But on the other hand of course as long as there is a strong will and our foresight to maintain what we want or aim for then everything can still be done slowly but of course it depends on those who want to learn it too because it cannot be denied that the stigma of wanting to get rich instantly with bitcoin is still one of the shadows especially for those who are just learning about bitcoin.