I don't really engage in this behavior, though I suppose I have a few times, maybe. I also though, am an enneagram 4. That may have a big role, given 4 thrives be authentic and is withdrawn. I also lack social interactions, so that also can be factoring. I have vented my frustrations to some people (called them dick, vented how they were acting mean) and then was neutral with the person. not overly nice, but neutral. I won't just act like they are my best friend.. That is stupid. I have criticized people's view before (elsewhere, behind their back), and act like i never have problem with their views and even engage conversation about those views I disagree with, but it is not malicious intent, and I just don't want them to have hurt feelings or to have bad view of me. it's always over mild things, though. I never will just suppress something that I completely am against or that I stand for. I will tell them to their face, even if in a roundabout, subtle way.
But for other creative Fe's, it probably has do with Fe being more loose and lesser firmly fixed in their views, and they can fleet, and they lack will to assert the shit talking, wanting keep harmony. Especially with SEi which more so values harmony because of Si.