My gut reaction to that question is always “no”, but I’m not totally convinced that I understand why I think that…
It seems logical to me that people can be taught the techniques and habits of people who practise critical thinking but - and maybe it’s because I’ve never knowingly experienced someone who has “learned” critical thinking - something inside me thinks that would just be imitating critical thinking. And if it is, would that even matter if the results are the same?
As I said, I don’t think I really understand what my reasons are so maybe it’s not very useful or valid, but I think that critical thinking is more than just a skill or practise or quality - I see it more as being part of who we are (or are not) and something than can be harnessed or developed, but not plucked out from nowhere.
Perhaps my real thought is that everyone has some critical thinking ability, but it’s just that the degrees are so different. But that doesn’t quite sit with me either, as I do think there are some people who will never be interested or motivated to dig deeper, and who will be happy to accept - or dismiss - things at face value. They might even use the techniques you’ve taught them, but they won’t really be interested. And if something needs a different approach, they won’t try to think of one themselves.
Maybe that’s a bit harsh but it reminds me of musical talent. I enjoy music and can hold a tune; I had guitar lessons for a little while in school, but I’ve never been able to reliably separate or name different instruments in a piece of music. I just can’t, and no one can teach me to, although they can teach me to play the guitar or piano. But I just can’t hear music that way, and I’m okay with that. I have no desire to take action based on that. Maybe the same is true of critical thinking, for some.