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

"It is important to be respectful of the local culture when visiting Chicago. It is important to be aware of the local customs and to be mindful of the language you use. It is also important to be aware of the local dress code and to dress appropriately. It is also important to be aware of the local customs regarding public displays of affection, as some areas may be more conservative than others. Additionally, it is important to be respectful of the local cuisine and to be aware of any dietary restrictions that may be in place. Finally, it is important to be aware of the local laws and to follow them accordingly," mentioned another expat when asked about moving to Chicago, the United States.