I think it's OK to numb yourself from certain types of feedback like insults, general toxicity, passive-aggressiveness, and so on. But I think reacting to those things should come from a place of empathy: for example I don't know what's going on in someone's life that might make them so toxic in their feedback, the toxicity is probably an outlet after many months of pent up frustrations that are the actual root of the issue they're venting about, etc.

I used to work in a customer facing support job, so I learned some strategies to keep cool from that.

Numbing and acceptance that shittyness happen are different.

I will strongly disagree that numbing is useful. I grew up extremely emotionally numb and distant. Looking back it never simplified things.

The knack is in detachment from your own views.

Numbing to me implies not caring, while detachment from your views can be born from caring about improving.

If you want to improve, this likely involves shedding some convictions you hold too close.

I understand that, just sharing what I see most commonly.