John: I think your proposal is fundamentally flawed.
Phrases Phrases for Complaining Politely
With all due respect...
C2Meaning
Used to politely express disagreement or criticism.
Example sentences
Alice: With all due respect, John, I've spent months working on this.
John: I understand, but the market research doesn't support your projections.
Alice: With all due respect, I believe your interpretation of the data is incomplete.