Well done those for judging people with different opinions than their own.
Personally I find that stuff boring, others like it, some love it. Doesn't really matter as we are all different.
Meh, if someone is publicly pronouncing their judgement ("All that ... is rubbish"); then I think it's fair to publicly judge them ("is miserable")
It's not like either is the height of insult.
Personally, I tend not to watch these things as I don't bother with any of the build up (I used to, but as a long-time fan, and forum user, my own analysis, and that of most posters, goes beyond what is shown on telly) - if I time it right, I arrive at the last note of the last anthem.
But I'm not going to say that the "welcome" stuff is rubbish; or that singing anthems is rubbish (though insisting on having multiples, or getting overly precious about your dance is a bit rubbish - and, of course, GSTK is a rubbish anthem).
I'm also not going to approve of TV cutting away from any of that - because if I want to cut away, I can always use the remote control, or just leave the room and put the kettle on.