OK, I'll go out on the limb here... I don't think anyone is questioning letting the disabled and families w/appropriately-aged children board first. Although I think that one easy way to solve the "Is your kid too old for special treatment" issue is to simply print some kind of code (similar to TSA Pre) on the boarding pass, or make families go to the gate counter & show proof of age & get some kind of ticket/pass to board early.
It's the other groups that board before F that are the issue. It isn't about "entitlement;" it's about getting what you paid for. If you pay the premium for F (as I often do), then part of that should be the ability to board immediately after the disabled/families. Lump the military & F pax in the next group, and then board diamond/ruby/emerald/sapphire/platinum/boron/zirconium/krypton after that.
Thank you, that's exactly what I was originally questioning because of my observation. I never said I had any issue with UA (or any airline) boarding disabled or elderly passengers first. However, my main reason to bring this up is exactly what ricport stated: it's everyone else UA boards before their Group 1. However, I would go further and add that families could go later and do on other airlines.
For example, WN. They have their 'Family Boarding' between Groups A and B. To me, that makes a ton of sense, on one hand they are taking care of their A-List and Business Select passengers, who fly them often and pay them lots of $$$$, and on the other, families have a set time to board. As you all know, WN has little trouble turning around aircraft so their system works very well.
Going back to my main point: UA has a image problem and they need to keep the ones who often fly them and pay them premium fares as happy as possible. One very simple area they could do this is by making sure those relatively few passengers feel in every aspect of their trip that UA cares about their business.