Yes of course, each country has its own culture codes and traditions.
I saw it the first time in Laos, but I experienced it here as well that whenever local persons passed my table in the hotel they bow their heads. They do it for respect, I know, but I feel very uncomfortable with it. If people want to show me their respect, a simple "hello" would be enough.
But - it is their culture here - so I respect it. In the office I work I kindly asked them not to do that and they answered "we have to".
Well . . . so go ahead :-)
Have a nice week
Bernd