Earlier quoted context omitted.
So, you are claiming they are "taking defense" not "taking offence"? Is this a terrible dad joke?
It is, but it's also a point - if something is being changed, pushing back shouldn't be assumed to be being offended. In some cases, the people doing the change will be offended if you don't comply. And that will keep going when the change is changed again.
> take offense (idiom) : to become angry or upset by something that another person has said or done : to be offended by something - Merriam-Webster
That's all it means. If you're upset because someone says something different to what you consider the natural default you're still offended.
People take offence to changes to and transgression against cultural norms all the time - offence at public gay affection, offence at interracial relationships, offence at not respecting christianity and religious norms, offence at use of swears, offence at the normalisation of talking about sex etc etc.
Taking offence to certain changes to language isn't necessarily wrong, but it's still taking offence. "Taking offence" is what happens to you when something transgresses against your belief system, it's not just what the bad people do.