No, the phrases "Due to respect" and "To be honest" do not necessarily bring negative content to the other side. The phrase "Due to respect" is often used to introduce a statement that is intended to be respectful or polite, such as "Due to respect, I must decline your invitation," or "Due to respect for your feelings, I didn't bring up the topic." Similarly, "To be honest" is often used to introduce a statement that is intended to be truthful or candid, such as "To be honest, I don't think the project will be finished on time," or "To be honest, I wasn't really interested in the movie." While the statements that follow these phrases may sometimes contain negative content, the phrases themselves do not necessarily imply negativity.

1. It is better to say "With all due respect" instead of "due to respect" 2. With all due respect means that you're going to be critical, negative, or argumentative BUT it will soften the next few sentences you say. "With all due respect sir, I don't agree with that decision" makes it more polite than "I don't agree with that decision." "To be honest" means the next things you're going to say are going to be negative or positive, but it should be a true opinion. "To be honest, this is the best cake I've ever eaten" "To be honest, I don't like John."