Many people are out there labouring under the impression that lateness is always terribly rude. I am here to tell you this is totally wrong. There are situations when, yes, it is rude. There are situations when it basically doesn’t matter. But there are also situations when being late is actually the height of good manners and decorum.
If you are invited to dinner, especially by a person who you can sense is an inexperienced cook or host, you should endeavour to be late. By at least 10 minutes I would say. But, honestly, if your host is a 25-year-old who has sent you a message saying, “I’m going to try making this :)” and then attached a picture of an elaborate recipe with two separate kinds of molasses, then I would say half an hour is probably best.
