It seems everyone including the speaker recognises that it was a mistake and offensive, apart of course from some people on GN who seem to think they know better than anyone else, including the speaker and those present at the debate.
Do you know differently, Glorianny? Or are you amongst those who just think they know better?
There is a difference between acknowledging that someone has been offended, causing offence and being offensive.
Acknowledging that someone has been offended is simply that. Many people these days are afraid of falling foul of the trend of no-platforming, which has ruined the careers of many, as, it would appear, Bradwell had hoped to do to AG-D. I'm sure that many people will have apologised for things they haven't done, having seen what has happened to people like JKR and Kathleen Stock, or Selina Todd, as Chewbacca outlines above.
Causing offence can be easy to do, particularly when dealing with people one hasn't met. We all know those who take offence at the slightest thing, and may ourselves take offence at things that would pass unnoticed to others.
Being offensive, OTOH, is subjective. Something is not, in and of itself, offensive, and whether someone's words are offensive depends entirely on context. If I said that I had read in a newspaper that Gransnetters were a bunch of ill-informed, foolish old women who would be better advised to stay offline and concentrate on knitting and making jam, I would not be being offensive (to most people, at least), particularly if I went on to qualify those words with a contradictory opinion of my own. If I said that Gransnetters are a bunch of ill-informed foolish old women who would be better advised to stay offline and concentrate on knitting and making jam, and presented the words as my own opinion, then I wouldn't be surprised if many Gransnetters thought I was being offensive.