I know some peope have underlying health conditions but some of the people you see crowing about their vaccinations have never shown any sign of this
I've had the vaccine. I'm mid 30s. I've used the NHS frame on my profile pic as I know some of my friends are reluctant and I wanted to normalise it if I could, i'm not 'crowing' I'm relieved to the point of tears that I am going to be able to leave the house soon - which I've done maybe 5 times since last April. I've had it because I take medication that stops my immune system working.
I take that medication because I have Ulcerative Colitis. It's a very distressing disease, with very distressing symptoms, that I certainly don't share with people I don't know well. I don't particularly like aquantainces knowing I suffer continence issues. I look perfectly well, in fact because of the massive dose of steroids I take (which also lower the immune system and would have put me in group 4 on their own, without the other medication) I often look VERY healthy, especially when I am in fact at my most ill.
There is absolutely no reason or requirement for people to say why they've been placed in a higher group, it's personal and private. It could be cancer treatment or any number of things that they don't wish to be common knowledge. Older people who are in lower groups are in them because they are lower risk than younger people with health conditions. I understand wanting the vaccine, and even jealousy that others have had it - I waited with baited breath for groups 1-3 to be done. But I didnt begrudge them their vaccines, I just wanted it to be done ASAP!
I had hoped that an unexpected benefit of covid would be a better understanding of invisible disibilities - colleagues previously thought of as healthy being required to shield for instance, and people maybe not being so despereate to come to work, especially when they can wfh, when they're ill and pass germs around because 'it's just a cold' without considering that for other people it's not 'just' at all! However I feel I'm probably going to be disappointed.