I did 14 over the last 13 years and dissociation in a bad way is something this technique does not, not in a bad way. There are different forms of dissociation: one where your body becomes alien, there is one, where your ego is not associated with the feelings, etc...

There is a dissociational element in vipassana, but it is that your ego does not associate pain with suffering or fine sensations with lust.

What I experienced in me and I see it in others as well, is that they deal with the real world much intensified. Of course, you distance yourself in the retreat, but this is for self improvement, as sometimes you need a time out to really look deep inside, calm your mind so it is sensitive enough.