That's a good line, but I bet it's factually false.
That's a good line, but would you care to suggest why?
Because when Britain switched from coal gas to natural gas (low in carbon monoxide), the national suicide rate dropped by 40%.
Suicide is often an impulsive act a person might commit once in their life. Rudeness is a persistent pattern of behavior that exhibits itself many times a day.
I agree. Rudeness is a subtle act of body language that often goes undetected, and is probably only made more explicitly obvious by the presence of technology.
correlation does not equal causation
Rudeness requires both a rude person and an opportunity for them to be rude. Heck, even relatively polite people will be rude if put in the right situation.