I'm singling out this post, but it's one among many that I find objectionable.
'Virtually anyone classed as vulnerable' does not mean that there are not lots of younger people who have not had a chance to get a second vaccine. It does not mean that children can't have their lives ruined (and where do ethicists who question the morality of vaccinating them stand on forcing them to go to school?). It does not cover the people who turn out to have been vulnerable for reasons other than the ones that have so far been identified, ie age and certain underlying conditions. Most asthmatics, for instance, are not identified as vulnerable, but the Asthma Society believes that many asthmatics really should be.
'A large percentage' is very vague, and by definition it is difficult to know how many people have very few symptoms. What about the people not in that high percentage? The ones who may well have given up a lot to protect the old, but who may go on to get Long Covid? And Long Covid is not just another post-viral syndrome - just as Covid19 is not just another virus. Doctors and virologists are only now understanding how it works. As has been said, it affects so many organs that it is, to use that hackneyed word, unprecedented.
Being 'delighted' that you (and by this I mean anyone who shares the delight of the quoted poster) are able to get out and about because you have been vaccinated shows no respect for the people who have restricted their lives in so many ways when you were vulnerable. Can't you just hang on until everyone has been double vaccinated and the Delta variant is not running rampant? It really comes across as an 'I'm alright, Jack' attitude.
Finally, to suggest that anyone who disagrees with you is doing so out of cowardice is invidious and not even logical. There are numerous reasons why people might disagree, not least of which is the principle that we should all be in this together and that the young deserve the same respect as the old.