This is not so much about Catholicism and more about reactions to it, one thing to note about America is that it has historically been rather anti-Catholic. Now, it is not so much anymore, especially in the Northeast and maybe the Midwest. But if you land in the South (where I live) you will notice the change in attitude. Hardcore Protestantism that dislikes Catholicism. Now, it’s not nearly as bad as a Protestant living in certain parts of Ireland or vice versa. But if you wear a Catholic shirt or cross yourself during meals in public, you will get stares. And not all of them friendly. If are coming from Latin America where Catholicism is the norm most of the time (and I’m not sure which country you are referring to), it might come as a shock if especially in the South.
Anti-Catholicism has been called the Last Acceptable Prejudice.