I have not once, ever attended a traditional chapel that had a "stable and joyful community life". They're a bunch of finger pointing, holier-than-thou, arrogant, misogynistic, condescending, racist, bonnet people. I have learned to go get the sacraments and leave.
Because the traditional movement is now so diverse, there is a tendency for some people to overly justify their chosen position by condemning other positions. This is not right nor healthy but it is happening. I don't know where you are from but here in Ireland the SSPX Mass centers, for the most part, are welcoming places. We have quite a variety of different nationalities attend too, from the Poles, to Asian, to African families. The outreach to them has been exceptional.
True, I do not like the dogmatic Sede-vacantist position and have been quite verbal about this. But this is because it is neither a traditional stance (it is a novel idea) or Catholic - because immediately you are setting yourself up as a your own Pope and church - making a dogma out of a perceived theologically opinion. However, that said, we have a number of people who consider themselves 'sede-vacantist' and they are all welcomed and wanted because they keep their personal belief to themselves.