From Beck's article:

If you have ever worked in the restaurant industry you know the reputation of the Sunday morning lunch crowd. Millions of Christians go to lunch after church on Sundays and their behavior is abysmal...

Yikes. I worked at a small breakfast & lunch restaurant for 4 years of Sundays and never noticed this. We had a noticeable rush after the 8AM, 10AM, and 11:30 masses let out so we had a sizable Catholic crowd and I never took note of their behavior.

Not trusting my own memory, I called my mother who's been a waitress at various restaurants for 30 years, most recently including 9 years serving the after-church crowd every Sunday. I asked her whether the churchgoers behaved any differently than the other customers. She said no. I told her about Beck's article. She said they didn't act any worse or better than other customers.

Just a little anecdotal counter-evidence to reduce your possible confirmation bias the next time you go out to lunch on a Sunday. I live in Massachusetts. My mother is Catholic. Obviously the overarching point of the post may still be valid.