sure, though I think emotivism is pertinent here, for example
> "I think you're wrong" is to think you're being attacked
This is exactly what the emotivist thinks because challenging an idea means challenging a preference which is directly challenging the moral character of the individual. There is no ability to discuss things in a detached way for them; this seems to check out anecdotally.
Is that "not fine?" - I certainly don't like it, and I don't think it's fine for people i choose to interact with, but my first step is to understand it, if only because there are so many people like this. Folks will continue to act like this despite my desire to see the opposite behavior, so it's good to be prepared and not self-deceive what other people are really like.
> My comment is about the idea that people aren't used to having their beliefs investigated or challenged.
I think I get where you're coming from. someone people not used to something could be said to having a deficiency in dealing with that situation and presumably with more experience they would change their behavior.
But I think there may be a slight difference in what I was saying, which includes some overlap with your point, but also allows for people who are quite familiar with being challenged, but yet immediately disapprove of such behavior anyways, due to the explanations above.