This is more of a criticism of literary prescriptivism than anything else -
Stephen Fry is correct that the series of phonemes constructing the word "offended" are inherently meaningless.
This is also true for every set of phonemes - all of the sets of phonemes we group in words have had their meanings ascribed by humans.
Denotation and connotation may be defined as two separate elements of a word, but the effective meaning of a word is not in the series of phonemes themselves or even what a group of humans with a particular level of authority says the word should mean - the true impact of a word is the message conveyed to the listener, whether it be denotative or connotative in nature.
Because of the way words acquire connotations due to emotions in response to the concept or event being represented by the word being associated with the word itself, words can have different effective meanings to people who have experienced different situations and heard words ascribed to their different situations.
Humans tend to be very object-based, and language and the deployment of words is a convenient way to label things for ease of cognition and explanation of cognition to other humans - but we forget that the word is meaningless; it is the conveyed message that matters.
Due to the effects of connotation, a word tends to have a gradient of meaning - especially words that convey a category. Meaningful categories tend to contain more than one idea grouped together based on a similarity. But that does not mean every idea represented by the label has the same meaning - ascribing a label to something does not homogenize it with other members of its new category and does not subtract any information.
Categorization is often times not done based on emotion unless the category itself explicitly has to do with emotion, yet because categories themselves are words they to are equipped with connotations based on ascribed emotions. Because typical members of the category tend to elicit a certain emotional response, the category obtains the same emotional response due to associations - this is how slurs "work", by attempting to categorize people under a label that is loaded with heavy, heavy negative connotations. People object to being misrepresented and are thus feel the range of emotions transcribed as "the state of being offended" by humans.
But to get back to Stephen Fry's quote: he makes the point that just saying "that offends me" doesn't really send much more information than "I am experiencing negative emotions expressed in a certain gradient over this". That is true, and I agree with him that just saying you are offended by something does not actually transcribe something with the characteristics that would lead it to be categorized as offensive.
But then fools try to overdraw this logic to say that the very concept of being offended is being ridiculous. They seem to be under the deluded notion that if they can disavow the label offended for any connotation under its gradient than all of the ideas conveyed by the word must also be invalid.
They try to attack the idea of a person not wanting to have untrue negative connotations ascribed to them by attacking the word used to represent the idea of a person not wanting to have untrue negative connotations ascribed to them by pointing out that this word can also be used in a fashion that conveys only vague discontent. Their baffling logic is that if the word offended is disavowed for this one definition than all meanings represented by the word should also be disavowed.
This image is effective because it takes far more to explain to people how human language operates than it is to shout about how since this word has been overused now the concepts traditionally represented by the word have had their honor damaged.
It is usually used by spineless fools who cannot think of a way to effectively argue that people should not be upset by untrue negative connotations being ascribed to them but also lack the guts to say that they do not care how this other human feels.
/rambly post about semantics