Phrases that can help defend personal boundaries
➧ I respect your opinion, but I don't accept it.
➧ My "no" always means "no", no need to think anything through
➧ Of course, I understand that you didn't mean to offend, but it was unpleasant.
➧ Thanks for the advice, I'll take it into consideration/think about it.
➧ This is your personal opinion and yours alone. I have a different one.
➧ I respect your opinion, but I don't accept it.
➧ My "no" always means "no", no need to think anything through
➧ Of course, I understand that you didn't mean to offend, but it was unpleasant.
➧ Thanks for the advice, I'll take it into consideration/think about it.
➧ This is your personal opinion and yours alone. I have a different one.