I also live in Vietnam and that's utter bs, sorry. People in Vietnam are generally chill and lovely, until they get onto the road where they become selfish, entitled, noisy assholes. They honk to avoid having to look, wait, or slow down. Trying to be a pedestrian in Vietnam is extremely stressful, nobody will ever give you right of way even on a sidewalk, instead they'll just drive directly at you while honking until you get out of the way.