Also note that Yuki often reacts or communicates with no filter (Gasly mentioned it in an interview), a bit like Steiner does at Haas. Speaking with no filter (or not realising the impact of doing that) could be an indication of a form of Autism Spectrum Disorder.
I'm not saying that they (Yuki, Günther) have autism, I'm not in the position at all to judge that since I don't even know them face to face, but it may be an explanation that's plausible.
One could also say that people who communicatie with no or little filter are more honest in what they say.
I am a Millennial and quite sick of people trying to find pathological excuses for people just being a-holes.
Steiner is a flat-out a-hole. Worse, he knows he is, and does not care.
Frankly, I don't care for drivers who shout and scream and carry on like pork chops at their race engineers. A surprising number of "popular" drivers are on that list.