“Why would it be more strict by a goy?”
In Halacha, I believe it is because the prohibition for a Jew and the prohibition for a Ben Noach are derived from different psukim, but I don’t remember the details. I would suggest listening to some of the shiurim that discuss this topic. In hashkafa, I don’t know the answer and would be interested in learning, but I would be wary of having that discussion on this forum because it not such a politically correct topic and there are a lot of nuances, so it’s likely that some readers will be offended and take it the wrong way.