I'm going to go off on my boss/father for now knowing english after living in the us for ~20 years
What is the reason why something like this creates anger for you?
Being this naive makes me feel kinda sick, I wish he'd been more realistic from the beginning.
I think that you should cut him some slack, English is hard! At least he is putting in the effort to learn it now!
What if I told that the other places I have been living he never got to learn English just because of a few points?
Just do your best to be understanding towards your pops. There are many things that parents have to worry about that kids do not realize. For this reason, it can be very challenging to find the time to do something extra like learn another language.