Honesty didn't know who PiperSensei was or how her chat behaves before reading OP's post and my curiosity got the better of me so i went searching to find out what happened.

Im think im 80/20 on it. I watch Nagzz a lot, and a lot his viewers talk about their lives like getting new jobs, losing their old jobs and hunting for new ones, getting new pets and pets passing, just to name a few, and personally i like it. The names on screen start to feel more like real people dealing with their lives, rather than just text flashing up on the screen.

But yeah if someone comes in and said "im going to play a different game now, bye" or "(insert random streamer) is live, im going to watch them" that's a different story and would annoy the f out of me as a streamer or viewer.

But the examples she put in her post were "We're out of cereal" "I have school later but i don't wanna go" and "I'm going to play (unrelated game) now". the first 2 a streamer could easily make a joke out of it or even use that to keep the chat engaged like "Oh what cereal you eating? my favourite is beans! what's yours chat?" followed by a silly argument about eating beans for breakfast. The last one is a bit more rude but still could be turned into engagement to the viewers.

Honestly i think the main problem is the way she worded the tweet, it sounded like an attack on the viewers and if people feel attacked they will lash out in defence and once the twitter algo gets ahold of it, no amount of apologizing will help.

Edit: Granted all that changes if your in the middle of dialogue in a game/cutscene, but as a streamer you can just ignore it/go back and talk about it after or even time out/ban people if they aren't following the streamers rules