I'm probably about the same age as you, and I think YABU to (a) equate reactions to 'bad words' to general resilience; (b) think that this has changed fundamentally, rather than in detail, over the years; and (c) to imply that 'making things too comfortable' for people decreases resilience.
(a) Resilience refers to the ability to cope with life in general, rather than whether you do or don't make a fuss about someone using the wrong words. FWIW, I DO think that people often make too much fuss about what words people use, rather than their actions and basic attitudes. And this was always the case (see (b)). But it has little or nothing to do with resilience,
(b) People have always made a fuss about 'rude words': at one time, it was a terrible taboo to say 'damn' or 'bloody'. And certain topics, like politics, religion, sex and money were often taboo. Obviously, people didn't make a fuss about words on screens before there were screens in the modern sense. But blasphemy laws in the UK were not abolished until- wait for it- 2008!
(c) I certainly don't think that, in general, resilience is decreased by having things made 'too comfortable'. Of course, it depends what you mean by 'too comfortable' and whom you mean. Probably being totally sheltered from all unpleasant facts of life would make you less resilient. But the way it's often used is to imply that any accommodation - 'pandering' as it's often termed in this context- to people's weaknesses (physical, mental or caused by the situation, e.g. financial crisis) will just encourage their weakness. And I think that the opposite is usually true. I have some relatively mild physical disabilities, and because nowadays people are usually willing to assist me when needed, I can lead a pretty normal life and work very hard. When I was younger, and there were more people who thought that (as someone once put it to me) 'such help is a gift and not a right', my disabilities restricted me far more and made me less resilient. Unfortunately, people with the same disabilities who also come from poor backgrounds are often still treated as undeserving, which often makes them less resilient.
What is true is that security is often more important than comfort in determining resilience. Many people who worked in tough manual occupations, but with the security of permanent employment and regular pay, were probably more resilient than many people nowadays who are in lighter, but more insecure, employment,