Yeah and that sucks. Well, let's just say that the forum is not for them and they aren't willing to learn Bitcoin or they aren't interested in it to stay here in the forum. This forum is a great community where many people share, read and learn about cryptocurrency and they'll surely miss it. Anyway, there are other ways to learn about crypto I'm sure you know it and maybe that's why they left because they may have read some criticism and feel bad or they may have taken it seriously (who knows why).
When reading a criticism that turns out to have no solution to it then a person who is criticized will feel that he has made a mistake.
Everyone's mentality is different and if he cannot overcome it into something positive then he will stop there.
Sometimes those who are criticized will take anything seriously depending on the context of what is being discussed.
There are many other ways to learn about Bitcoin, there are many social media, including Youtube with explanations that may be visually clearer but Bitcointalk is the center of Bitcoin and cryptocurrency knowledge, here we discuss everything in detail.
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You can never know how certain people will react, and some are more friendly, others seem aggressive. It's important that you don't come here with a prejudice or negative attitude because you will receive the same treatment or worse. Genuine and honest people will get the help they need. It might take time, but you will get there.
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Have an open mind and don't use feelings but use your mind to digest everything.
As a member of the forum who has been here since 2016, I get a lot of negative comments,
and positive and some constructive comments we will know what is wrong with our threads and comments and some are just present with words that seem like belittling.
So no need to argue, just relax and take everything positively.