How should I ask this ?

So my 28m old after attending play school just for 4 days now, tells me “angry” whenever I ask him “what did the teacher say at school?”

It’s just “teacher angry” with hands on hip action.

To him hands on hip means “being angry”.

He hates gng to school (which is as expected as he has just begun) & says “bye bye teacher” when I go to pick him up.

I am worried as to why he says angry & how do I (or should I even) take this up with the school authorities ? Or may be even ask the teacher itself directly?

* updated*

When I ask how he is at school, they tell me that he is responsive , attentive , participates in grp activities , whines inbetween saying “mommy mommy “ sometimes with tears & sometimes without which I believe is pretty normal for week 1 given that he is away from me first time ever since birth . Overall bright kid is what they say though I feel too soon to say so .