Z
Zzyzx_Road
Guest
No set rule. Dependent on the culture. For instance, in Thailand, Thai Catholics do not touch each other physically, they “wai” each other. This is their culture’s sign of respectful greeting. In Vietnam, they will just say it to each other, not shake hands. And so forth. If you’re in a foreign country for vacation or work and you attend Mass there, it’s okay to take your cue from the locals.