Responses
I think Yuri doesn't respect Jiri as a "teacher" (or even as someone who is older) and treats him as someone on same level as him. The way Yuri grabbed Jiri by the neck is exactly the same as when Yohan grabbed Yuri in 31st chapter when he (Yohan) was pissed off...
Why are you grabbing a teacher by the neck. That's rudeeee. I can't even speak informally to my teachers.
Seriously whenever Yuri being rude to Jiri, I got shivers because I remember how scary my teachers that I can't even look at them in the eyes