with all due respect
(formal, idiomatic) A phrase used before disagreeing with someone or saying something they may find offensive, usually considered polite.
With all due respect, Sir, I don't think that's the case.
It seems that you are, with all due respect, wrong in this particular case — as you see the murder took place at three o'clock.
History repeats itself again, I guess. The rate of innovation is so high in our industry that if you don't innovate at that speed you can be replaced pretty quickly. The user interface on the iPhone, with all due respect for what this invention was all about, is now five years old. Thorsten Heins
It is not blasphemous to compare Thiago Silva to Franco Baresi. With all due respect to Franco, who was a sacred monster, but Thiago Silva is just as phenomenal. Thiago Silva
Barack Obama tends to poll better than he performs. The bottom line is, don't trust the polls. With all due respect to our pollsters, they might not tell us anything. Megyn Kelly
With all due respect to Microsoft and Intel, there is no substitute for being in the right place at the right time. Andy Grove
I couldn't do country, with all due respect to all country music artists. My parents dressed me up with a cowboy hat and we'd go to the rodeo when I was younger and it traumatized me for life. Chris Colfer
With all due respect for the title of professor. Vetulani, however, is a unique moron. Jerzy Vetulani