By your definition, it is still inflammatory. That would preclude any former Catholic from referencing the fact that they were baptized in a Catholic church and then made a different choice.
... people like you ...
oops, that slipped out
The bishop didn't choose those words (and I venture the intelligent guess he would never THINK of referring to himself as a former Baptist, just as I never refer to myself as a former Catholic)
Mindreading; the fact is he is a former Baptist and chose to become Catholic. The fact is not inflammatory, except in the same sense that Moslems are inflamed when a someone leaves their religion and chooses something else. They take it to an extreme.
You just can't stand it that someone might reject your religion and you take it personally as if it is a rejection of you .... nay, rather ... a personal affront, like a slap in the face or the first punch