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

"It is important to be aware of cultural differences when visiting Rotterdam. It is important to be respectful of the local customs and traditions. It is considered rude to be late for appointments or social engagements, so it is important to be punctual. It is also important to dress appropriately for the occasion, as dressing too casually or too formally can be seen as disrespectful. It is also important to be aware of the local language and to avoid speaking too loudly in public. Additionally, it is important to be aware of the local laws and regulations, and to avoid engaging in any activities that are illegal in the Netherlands," remarked another expat who made the move to Rotterdam, The Netherlands.