The fact is, language and attitudes evolve as time passes.
What may have been acceptable twenty, ten, or even five years ago, may not be seen as acceptable now.
Part of the requirements for an adult living in a civilised society is to be aware of such cultural changes, and adapt to them.
If you feel comfortable giving offence willy-nilly because you feel you have the right to 'plain speaking' ( which is usually the refuge of the terminally rude), then that says more about you as an individual than the person(s) you may offend.
Ms. Rudd used a term thoughtlessly, it was a slip and she apologised.
Diane Abbott is someone who could be offended by the sound of someone breathing heavily after a five-mile jog - so this is sadly an opportunity for her to remind everyone how achingly right-on she is - which does the majority of her ethnicity no favours whatsoever.