A court in the superior country of Germany ruled that intentionally blowing smoke into someone's face is criminal assault. What are your thoughts on that ruling?

The story went like this:
At a disco, a female student repeatedly pointed out to another guest that smoking was not allowed in that disco.
The guest then blew cigarette smoke into her face, in response to which she smashed a glass on his head.
The court ruled that the attack with the glass was self defence.