Twitch IRC tag "flags" is undocumented
In the twitch IRC tags documentation, there are multiple instances and examples of the "flags" tag being returned. But it is not documented, its use is related to automod but to what extent is not known.
Undocumented yes but this is what the letters mean:
A: Aggressive Content
I: Identity-Based Hate
P: Profane Content
S: Sexual Content
The values are the indices just like emotes.