You're describing the bad behavior of individuals. There is no Catholic teaching that would bar anyone from becoming Catholic. In fact, those individuals were acting contrary to Catholic teaching.
I've never heard of that kind of behavior. That doesn't mean it didn't happen. What it DOES mean is that it's not policy.
What it also means is, "Don't be a wussy." If some priest or whatever has his or head where the sun never shines, you write the diocese. If that doesn't work you call the diocese, repeatedly and firmly, though politely. If that doesn't work you write the Vatican. Their turn around time on letters and enquiries is supposed to be under 6 weeks which I think is pretty good.We are often mocked because our bishops don't seem to know what's going on. And then it turns out the people complaining haven't tried to let the bishop know what's going on. AND if the bishop could afford a secret police and network of spies and had and used one, the complaints would shake the rafters of heaven!
You gotta make calls if you want to get result. And our claim of ecclesiastical holiness does not rest on the character (or lack thereof) or ineptitude or stupidity of our clergy. It is in SPITE of those more than normally earthen vessels, not because of it.
We grow roses. it takes manure to grow roses. Believe me, we've got the manure.
Two years ago I sponsored a wonderful woman for confirmation and reception. The service started, as all Easter vigils do, with the lighting of the "new fire" outside in the courtyard. My friend is short, and she wanted to see. I said to her, "You're almost Catholic. Use your elbows."