For the friends and family that I'm close enough to know the details, all have had some term of parental support. Some of had tens of thousands for deposits, other have paid minimal / no rent while living at home, others have built savings from student loans etc has they had uni fully paid for them.
Among my peers, network etc I haven't seen or heard anything I'd call stigma about receiving support; if anything, I've had a number of people be completely baffled that others don't have parental support, and feel a bit snobbish about those who haven't bought a house, despite not understanding the difference that family support makes, even if it's 'just' a few hundred pounds here and there.