To your first point, he stated he has being going to WDW for 25 years. While I don't understand why anyone would go to a mall or any grouping of different offering and expect them all to have the exact same hours, at WDW many different places are open different times. Its posted all over the website/apps/buildings themselves. Asking anyone to know the hours of a place you want to visit isn't unreasonable. Thinking someone would use there thumb to look up on the ap when something is open when they want to go there isn't unreasonable. If you want to go to a particular restaurant like say Gaston's and don't bother to check when it opens/close, your a moron. I don't care if your on vacation or not. If your talking about normal hours changing as a result of a special event, or emergency closure, sure maybe i could get behind that, although special closures for private events ect., are also generally posted with pretty long lead time that you should be aware of them. But this is just normal operating hours. In the day and age of apps where literally every piece of information you might need/want is available 24/7 at the touch of your finger, there is absolutely no excuse for not knowing when something is open/closed/prices, ect., except shear laziness.
As to your second point, I said it didn't have any impact on his bill, as he/she already said he tips already and over 18%. Now to be fair I 100% disagree with the idea of automatic gratuities, if is a mandatory charge its not a tip/gratuity, its part of the price your charging me. I don't like the idea that any restaurant does it, but its not a hidden feature for Disney restaurant. You know going in parties of 6+ are going to be hit with it, and it doesn't seem unusual that all people no matter age, are taken into account for party size. My main point is that don't complain about something that you knew about ahead of time, that you CHOOSE to do (they could have done quick service, split parties, or eaten off property), and then complain about it after. I don't like the policy, but its not my restaurant. If you decide to participate you follow their rules. I have known some people to not book a restaurant (wasn't a Disney one) bc they had such a strong disagreement with the automatic gratuity policy. My feelings on the matter aren't strong enough that i would walk away from a restaurant because of it, but that's an individuals choice.