I'm guessing you've never actually spent 8 hours or so in a stuffy office doing hard/stressful work with people who also take walks (e.g. to go get lunch and get back to the office in 30 allotted minutes).

Also some people wear too much deodorant.

I agree, none of this is an issue if working with clean, civilised people... a few feet away. It can quickly become uncomfortable if you're too close to each other.

I'm struggling to identify how it's not glaringly self-evident that the person you're replying to would not enjoy sitting next to people at bars.