Formal and formulaic language tend to dominate these encounters. It is also a passive aggressive technique to defer liability for aggression, but to also hinder the opponent. Non-DK filters may help leverage the respondent out of a stock passive aggressive response, but significantly decrease the efficiency of the survey administration. Place such questions at the end. There is an argument that recall is actually recreation.
Objective reality can be questionable.
Depends on the information sought and the expected level of reactivity. Depends on survey audience. Depends on the educational level of the audience. Odd numbers of responses. Sensitive behaviors may not be appropriate for odd numbers of responses because they allow respondents to fail to respond and fail to think about it.