There is an error in audio: it says "Dlatego" insetead of "Dlaczego". Reported.
Unfortunately the only thing that can be done is disabling the audio exercises, which has already been done. I think this also means that the audio doesn't play automatically but only when you press the icon yourself - but I'm not sure about it.
Yeah, that is problematic :/
Doesn't z usually mean "with"? I'm okay with a preposition meaning more than one thing, but laughing with someone and laughing at someone are very different... how do you differentiate?
"Z" can have different meanings. But I would treat this expression "śmiać się z kogoś" (to laugh at someone) as a set expression. When used with Genitive like in this sentence it usually means "from" (something). It would mean "with" (accompanying) if it were used with Instrumental - "Dlaczego ona się z tobą śmieje?" It would mean: "Why is she laughing with you?". But it would be better to say: "Dlaczego się śmiejecie?" (Why are you laughing?)
I'm not so sure about this translation.
"Laughing about you" makes it sound like she is laughing at the expense of someone but not necessarily when they are around. "Laughing at you" would mean that she is laughing directly at them in their presence.
Also, "laughing about" someone sounds more like there is something abouth their core being that is humorous. This, opposed to "laughing at" someone who has done or said something funny.
Both 'at' and 'about' make sense for Polish. Especially the 'at the expense of someone' part. When I hear "śmieje się z ciebie", it doesn't sound as if you hoped that she will react like that.
Not possible. The only thing we can do is disabling the audio exercises, so no one gets the 'type what you hear' exercise. Which has been done.
But in some Duolingo courses voices are recorded by humans not TTS. Is this feature locked on the English -> Polish course?
Those are the courses of languages that do not have a (good enough) TTS. At least so far, Duolingo doesn't want real people to record audio unless there's no other option. Believe me, if we could have a real voice, I would start recording even today.