What exactly is wrong with Irish or Italians specifically converting to Protestantism?

[Senator Incitatus]

Nothing specifically wrong with it.

It usually represents a nasty turn towards elitist conservatism common among newly rich social climbers. Evangelical converts are more likely to be zealous authoritarians than cultural Catholics.

I actually find the inverse to be truer. When I think of "nasty elitist conservative zealous authoritarian social climbers," Catholic converts are the first thing that spring to mind.