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

"It is important to be aware of cultural norms when visiting Antwerp. 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 Belgians tend to dress more formally than many other countries. Additionally, it is important to be respectful of local customs and traditions, such as not eating in public during religious holidays. Finally, it is important to be aware of the local language and to be respectful when speaking to locals, as many Belgians may not be comfortable speaking English," remarked another expat in Antwerp, Belgium.