Why do Irish people seem to have an issue with me as an American learning about my family culture and heritage?

I find this pretty distinct amongst the irish specifically. I've talked with germans, poles, brits, italians, etc. And they're all incredibly welcoming to the idea. But the only ones who seem to get mad that I'm trying to get into my family's culture and heritage seems to be the irish. "Oh you're American though, that's your family, you can only do American things." And it's funny because the only ones who have placed this judgement before on me have been fellow americans. Like "we don't have a culture and refuse to learn about our heritage because we're colonizers." Just the wokest stuff I've ever heard. I just don't get it.

Why do Irish people seem to have an issue with me as an American learning about my family culture and heritage?
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