Having been both Evangelical Protestant, and now Catholic for 12 years, I have too noticed a big difference in the friendly department.
I think the right question though is not “why do Catholics seem rude and unfriendly?” - like someone said, that is human nature - people, including Christians, get into bad moods, are grouchy, and get into their own little self-absorbed world and don’t take efforts to reach out to others around them.
I’ve been in Protestant churches, usually older mainline denominations, that are the same as what I’ve experienced in Catholic parishes.
The right question is “why are some Protestant churchgoers so very friendly?” Why do they act that way, what is their motivation? They are human too, and can act rude themselves, but generally if you go to an Evangelical or Pentecostal protestant church service you are going to be bombarded with happy and meet extremely friendly, welcoming, cheerful, almost giddy people.
Why is this?
There are a couple of reasons, from my experience and observation:
- They are trying to win converts for their church - protestantism is highly competitive, and the way this has shaked out is that groups of vibrant, happy, friendly people are very attractive, and so congregations bent on growing their church, and attracting as many followers, will act this way on Sunday morning, and often in everyday life, to put an attractive face on their particular church. Catholics don’t have this competitive attitude - you have to go to Sunday Mass if you are Catholic, and there is no sense of trying to win people to go to Mass here, rather than somewhere else - without the fake facade, “real” human attitudes shine through, and this gives the appearance of rudeness, especially compared to those protestants competing for members.
- Evangelical and Pentecostalism puts a high premium on acting happy, and demonstrating the “joy of the Lord” - this is how they prove to themselves and others that they are “saved” - they are on the way to heaven, and are dancing all the way - this doesn’t mean that they don’t get down in the dumps, or frustrated with their fellow human beings, it’s just not socially acceptable in those groups to show that you are unhappy in any way, because you are a Christian and should be happy all the time - I assure you, no one is that happy all the time - but they force themselves to put on that face in public, especially on Sunday mornings - sometimes it seems like a mask worn to impress others with how happy in the Lord they are.
If you have ever been around any cult groups, such as the Mormons, you will notice how overly friendly and inviting they are, they go out of their way to be friendly, take an interest in you, seem to really like you - they have what feels like a sense of family at their church, and they want you to be part of their family love - this is all to win you as a member. Remember that, whenever you visit those Evangelical, non-demonational or Pentecostal churches, because their particular type of friendly and happy flows from the same fountain.
It is what I call “salesman friendly” - a salesman is so so friendly to you, but why? It is so you will buy what he is selling.