Under topic of Science, page is telling me that Seniors are getting bathroom upgrades if they live in these zip codes: What?

So, I tried to delete that post, but it blocked the category of Science completely, so I had to unblock it. But my point is, Why if I do not want to see this post about Seniors getting bathroom upgrades and I try to delete it does it make an entire category go away? I am sorry, but this is just goofy (trying to be polite here). This is simply Not about Science whatsoever, that Seniors are getting bathroom upgrades if they live in these zip codes! Also this Same thing has been posted Multiple times in other Categories! Again, this post typically has Zero to do with the Category that it was posted in! I mean Zero Relevance or, more accurately, actually Less than Zero. So, in the past, I was able to get rid of a post, but now, if I try, it blocks whatever category that the Ad was posted in! What? Is this now the price of having Firefox? That I have to have postings that I can not either block or delete? Really? Please explain and tell me why I can not target an individual ad from being posted. Thanks for your time. John D