no offence could mean  i am  about to  insult  in some situations  but it could be also just  a way to  prevent someone that you will say something that they might not like , it does not mean necesary  that you insult them , you just tell them something that you think it might hurt the feelings but not necessary an insult

thats exactly what happen, it come as a free pass and to make the un-decent look into more decent and formal.

What a parody