I'm completely cool with all of this, but this was not the environment for a fast club pace line ....Well, it depends on what the club ride is for. Some clubs have groups who want to race and then yes, it is echelons when need be and pacelines when need be. There is a time and place for all sorts of riding requirements.
That doesn't mean every club ride should cater for granny-gear riders who stop at every garden centre tea garden and blow their noses with lace hankies and bitch about lycra and clipless pedals.
How do you propose people build the skills required for elite-level cycling? By watching TV?
..., until you find yourself in the middle of a fairly busy, mixed ability event, when you find yourself relying on the correct signals coming from the riders in the group, positioned in front of you, for safety's sake. .....
If you're a faster, more able group of riders in a non-race situation, you should show consideration for slower, less able riders, and if that means backing off or breaking up a pace line, then suck it up or find a different event.