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

"In Vevey, it is considered rude to be late for appointments or meetings, as punctuality is highly valued in Swiss culture. It's also important to respect the local language, which is French in Vevey, so try to learn a few basic phrases. Avoid discussing personal matters or asking personal questions in public, as the Swiss value their privacy. It's also considered impolite to raise your voice or display strong emotions in public. When dining, remember to keep your hands on the table (but not your elbows), and always say 'Bon appétit' before starting to eat. It's also customary to wait for the host to start eating or drinking before you do. Littering is frowned upon, so always dispose of your trash properly. Lastly, the Swiss are known for their neutrality and peace, so avoid bringing up sensitive topics such as politics or religion," remarked another expat who made the move to Vevey, Switzerland.