They never sit with their sadness, we only tell ourselves this to feel some solace
Avoidants are MASTERS at switching how they feel, and if they have a bit of hard time, they find something to watch, pick a new hobby, post online for attention seeking, dating apps, go out every single weekend on dates, to clubs, out with friends and so much more that they literally can't sit with their feelings.
They absolutely love one night stands, we need to remember also that we are not their first victims, or last victims, we are a number on their list of exes or hookups, they were perfectly fine (according to their idea of perfectly fine that is powered by delusions and distractions) before us and they are perfectly fine after us, if they EVER miss us, they would just miss what we offered, not us, and it will be for a couple of days then they go back to filling their schedules with all kinds of things.
They are incapable of feeling miserable for long periods, that is the whole point, there is no justice, there is no karma, they will live and die with a smile on their faces because no matter what happens they are extremely unlikely to face their wrongdoings and the people they lost, you may call it fake happiness but to them fake and real happiness are the same.
They don't care what is real and fake, all happiness to them is happiness and sadness is something they rather die than face. Even regret, they literally do not believe in regrets, because regret is enemy of happiness and that is an absolute no-no. They mostly will get away with it all, only very few of them actually don't, life is never fair and it never will be