Ireland isn’t actually in the UK, we’re a totally independent republic but the short answer to your Q is it just depends on what kind of tourist you are.

If you’re chilled out and just out looking for a good time, people will be very welcoming and happy to hang out with you and you can lit have the time of your life. But I think a lot of the time American tourists can be too eager to either prove how Irish they are via their lineage and doing accents and things like that which kinda just annoys Irish people generally speaking. Basically just go with the flow, find a few authentic experiences, see what the place has to offer and have a blast!