I certainly was taught good manners by my parents. They are so instilled in me that I really DO notice when people display less than perfect manners themselves.
I really cringe when people don't hold their cutlery correctly, or throw the knife and fork onto the plate when they have finished eating, and I was also taught to put the knife and fork down in between mouthfuls.
It is incredibly rude to lick a knife, as well as downright dangerous if it is a sharp one!
Eating in the street is common - eating is supposed to be a relaxing, pleasurable experience, that's why we sit down to eat in a calm environment. Also, unfortunately, a lot of people who do eat in the street just discard the packaging where they are when they have finished without disposing of it properly.
Starting to eat before all the table have been served is incredibly rude, even if the hostess tells you to start.
If you are served a bread roll at dinner, you help yourself to butter for the entire roll, then break pieces off and butter them separately, you do not butter the whole roll and then bite chunks off!
The correct response to 'how do you do?' is 'how do you do?', not 'pleased to meet you' or 'fine thanks'.
'Pardon' is awful, although 'I beg your pardon' is acceptable in cases of real misdemeanour. The correct word is 'sorry' or 'what'.