I clicked through and had to go to a second linked article(!) for the top 5. The #1 is “Dallas-Fort Worth-Arlington, Texas”, which is pretty much a blue city now.

This doesn’t really support your claim that “they are all red”. Also, we call a “blueish spot surrounded by red” a blue city.

From what I am learning about in this thread is there isn’t really the idea of a “red city”, so when people talk shit about “blue cities” they are just talking about city life in general. There does not appear to be any very large cities filled with Republicans.