1. There's nothing to respond to. The puppet only exists on SIC and will vanish with time. Much as players are discouraged from creating uninteractable characters with their spoofs that other players can't respond to, I think these often create situations where a player might want to respond, but can't.
2. There's no 'character' behind it. No NPC that you may have history with, or know how to gauge their importance or relevance to your character by. In effect it feels like comments directly from the staff (which it is, really) which is fine when it's theme enforcement, but doesn't foster a lot of good feeling when they're just pejorative.
My impression is there's a whole system in place for SIC chatter to make it easier than puppeting characters, and I think it adds a lot of atmosphere when it comes to events and keeping everyone clued-in to the basics of what's going on elsewhere, but if I get this comment on SIC:
Rando: >> No one likes you 0x1mm, fuck you!
And I can see it's coming from a SIC puppet, how is anyone to interpret this without a real character behind it to add context... except as being direct commentary from the staff?
If I get the same from my NPC boss, or some allied faction, or an enemy faction, or someone from a group I can disregard, then it's easy to contextualize that as being IC, but I think the anonymity of the current system really works against that.
My suggestion is if staff want to use this sort of tool to guide or influence players, they should use actual NPCs for it, and leave the SIC puppets for background chatter.