are good manners lost forever?

having travelled to a few countries in different continents, one quickly realises that what is 'normal' for you might not be so for others
i guess that's the necessary humility that comes with travelling, for instance, i remember having been told, not one but many times, about table manners: the way to eat soup or, never use your hands at the table; however, in india and somalia for instance, for practical reasons the way to eat is precisely with your hands, and it's perfectly polite!

but it's not table manners that i wanted to write about, it's about the concept of time and timekeeping, without even agreeing with the sadly famous statement of 'time is money'
how much are you supposed to be adaptable regarding the lack of timekeeping? i understand that culturally, in a continent were people are not pressed (which is such a nice thing), the concept of time is rather flexible and that people are or forcefully become easygoing on that
i was never the punctual type, unlike members of my family, but i begin to find myself annoyed at both locals and expats on their concept of timekeeping
when somebody says to you that they will arrive at 9am, and they arrive at 10am or even later, how are you supposed to take it? i guess what bothers me is the assumption that you have nothing better to do, or that you don't have any other appointments, therefore your time is fully free to wait
with the locals i confess i have more of a limit to my annoyance since i do truly believe that it will take me nowhere trying to explain what is already obvious
but with expats, in particular those who come from my very own continent, i find myself getting increasingly annoyed, as they have no cultural excuse and the assumption that i have nothing better to do annoys me even more
but where is the limit? i mean, 10-20 minutes wait, given the state of the roads and how long it does take to do anything here, that delay can be considered as minimum, but when it's 45 min to an hour.....

i realise however, that it's a lost war and certainly a battle i will not take up
my solution, a little blog ranting, it always help to let it out