Not the person you were replying to, but that was unnecessarily mean. Instead of just poking fun at someone else's ignorance, perhaps you can enlighten them?
Parties like Expedia do more tracking and analytics of what you look at, when you look at and how you look at offers on their site then most of the urls on the pi hole url lists, which are typically referral counting urls (many also just for adult sites), or just for counting traffic. And I wouldn’t be surprised if they sell this data too. Not saying they are, but I wouldn’t be surprised if they do.
Also since when is giggling mean? The assumption that I intended to be mean, is kind of mean too. This is about the same as somebody saying not to eat sugar yet eating lots of fruit that contain sugars, if somebody says that to you surely you giggle without being mean.