What cultural faux pas should I try to avoid making in Belgium?

"It is important to be aware of cultural differences when visiting Belgium. It is important to be respectful of local customs and traditions. It is considered rude to be late for appointments or social engagements. It is also important to dress appropriately for the occasion, as Belgians tend to dress more formally than in other countries. It is also important to be aware of the local language, as many Belgians speak both French and Dutch. It is considered impolite to speak loudly in public places, and it is important to be aware of the local etiquette when dining out. Finally, it is important to be aware of the local laws and regulations, and to respect them," remarked another expat who made the move to Belgium.