When I see the description that monort gave, I would think that in Germany this would be seen as somewhat bizarre (as in mathematician ;-) ), but not as "terrible taboo and social stigma" or something to be outraged about (as dean Schmid was in monort's description).
Quite the opposite: If you keep in mind that in many large German cities (such as Munich, Stuttgart and Berlin) it is hard to find an apartment, in particular if it is supposed to be affordable, I can imagine quite well that "living to the logical consequences that it is not worth the time to look for an apartment" could easily give him lots of sympathizers in Germany.
On the other hand Voevodsky would probably get in trouble with German law (Meldegesetz (https://de.wikipedia.org/wiki/Meldegesetz) - I don't know an "official" English translation of this word, but perhaps "registration law" might fit). But always keep in mind when talking about Germany, what Germans think and what the German laws say are two very different animals.
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Concerning your point
> There is no stigma against homeless people in your country?
monort's description of Voevodsky's lifestyle does not sound like the lifestyle of a homeless person. So the argument void. But to give nevertheless a point: I don't think there is a lot of a stigma against homeless people in Germany. The stigma is rather against things that accompany being homeless like drinking, rarely showering etc.
EDIT: To elaborate on the point that I don't think there is a lot of a stigma against homeless people in Germany: I (as an academic) actually know someone who was homeless for a longer time in life (at least 6 months, probably much more) and also had an interesting discussion about homeless people face in Germany with a homeless person who was begging for money when I was waiting for a train that was massively delayed.
I (American) have the same reaction you do. I think this is an incident where something is not properly explained so non-Americans think this is just some weird American thing.
The text " living and sleeping in the office is a terrible taboo and social stigma" is not phrased well. The issue with living at your office is much more due to liability reasons. If someone is allowed to live at their office, then the organization might be liable for anything that person does, or anything that happens to that person, even when not working. Also, as an organization it looks bad to have your graduate students / researchers be homeless, not to other grad students or researchers on an individual level, but in the sense that outsiders will react "I do not want to work at Harvard because they work their researchers so hard / pay their researchers so little that they have to live at their office."
This also happened about 25 years ago, when there was more of a stigma in the US for living an untraditional lifestyle. It's much, much more common these days for people in their 20s to live semi-homeless (e.g. in a car) and housing usually costs a lot more know, adjusted for inflation.
Quite the opposite: If you keep in mind that in many large German cities (such as Munich, Stuttgart and Berlin) it is hard to find an apartment, in particular if it is supposed to be affordable, I can imagine quite well that "living to the logical consequences that it is not worth the time to look for an apartment" could easily give him lots of sympathizers in Germany.
On the other hand Voevodsky would probably get in trouble with German law (Meldegesetz (https://de.wikipedia.org/wiki/Meldegesetz) - I don't know an "official" English translation of this word, but perhaps "registration law" might fit). But always keep in mind when talking about Germany, what Germans think and what the German laws say are two very different animals.
---
Concerning your point
> There is no stigma against homeless people in your country?
monort's description of Voevodsky's lifestyle does not sound like the lifestyle of a homeless person. So the argument void. But to give nevertheless a point: I don't think there is a lot of a stigma against homeless people in Germany. The stigma is rather against things that accompany being homeless like drinking, rarely showering etc.
EDIT: To elaborate on the point that I don't think there is a lot of a stigma against homeless people in Germany: I (as an academic) actually know someone who was homeless for a longer time in life (at least 6 months, probably much more) and also had an interesting discussion about homeless people face in Germany with a homeless person who was begging for money when I was waiting for a train that was massively delayed.