Ireland has a normalized use of swearing words in regular conversations. For example, if someone is talking about a trip they are planning on, they may go through a bunch of F words. But this is not meant to be rude or inappropriate, but the opposite; Irish use these words to show excitement on the plan.
The closer the fried, the more slagging. Slagging is being mean to someone but in a loving way...confusing, right? Well, for Irish culture, it is a way of showing affection to make fun of people you love. For example, if I am going to make food, my sister can joke to me about me being a horrible cook, but out of love.
In Ireland, time is not considered that big of a deal. It is really common to have people coming in 30 to 60 minutes late. This is not seen as mean, but more relaxed and chill.
Dining etiquette: It is very standard to wait until everyone has their plate in front of them before anyone starts eating. Also, do not speak with a mouthful, do not place your elbows on the table, do not blow your nose, etc.
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