No really, I have to emphasise this again.

There is no hint of a joke.



There is no hint of a lie.



Ouma personally insults Shuichi.



insults Shuichi. This conversation ends badly.

Besides this, Ouma repeatedly [makes allusions to bad things] regarding Shuichi, as well as detectives generally.

I think it’s more than safe to say that that’s relevant, [given Shuichi’s lab].