Emperor had it coming.
Bro may have supported the empire, but there was little loyalty, his loyalty and their groups was to the hero Reid
So when Emps started shit talking the hero after he died that tangential shred of loyalty was burnt to ash and cinders.
Extrapolating a bit...
It also made it shockingly clear that the emperor had no respect for even the best of the people fighting for him. They were putting their lives on the line for him so that he could... mock them behind their backs and spit on their graves. That's not the deal soldiers expect, particularly not for bona fide legends.
This attitude probably extended to all the country's people. If that's how little he thinks of the hero, and how willing he is to show it in front of Reid's grieving subordinates... what does he think of the people who AREN'T out there dying for his sake?
He illustrated in just a few seconds that he was not deserving of his throne.