Oh, laugh about trump, he's the head of a country and should either know better or listen to his advisors. I was mostly referring to average people.
About the surface survival ... that's actually a thing.
My (granted, superficial) dive into the literature has provided no exact time frames of how long the virus survives on surfaces, but it can easily be hours to days. There's a paper in which they checked where a patient left virus particles.
SARS-CoV-2 needs the ACE2 receptor, which is found a lot on the surface of cells in the respiratory tract (a review paper on that), so the general consensus is that it needs to somehow enter that (nose, mouth). However, I need to repeat that we don't know everything yet, so I wouldn't 100% rely on that.
Bottom line: Completely changing your clothes after shopping might be overkill. Touching groceries and packages might actually be risky, but I honestly don't have the patience to sanitise everything I buy. I try to minimise the number of things I touch outside, try not to come too close to people, and sanitise my hands if I have to touch something.
I think that, for a politician, knowing better takes the form of listening to their advisors. That's the most frustrating thing about the whole thing. He listens to his advisors as long as their answers fall in line with his narrative; otherwise, they may as well be speaking to a wall and it'll probably not be long before they're fired and replaced with a yes-person.
I absolutely will not, but it's good to hear it from someone who knows more than I do. Like I said, I'm living a sort of mismatched approach from what actually makes sense to me. Unlike some world leaders, I'm not so arrogant to risk others' lives on my own misplaced confidence.
Thank you so much for your response!