I would like to visit Italy. I posted a supposed itinerary in the Italy section of the travel forum, I which I made up with the help of Rick Steves Italy 2017. In 2016 I went to London England. I forgot to take a copy of the itinerary which I should have printed, from Expedia.com, the website I had bought my airplane tickets from. I traveled alone. I am a 33 year old single man. I had difficulty finding my itinerary in my e-mail, when I got to Heathrow airport in London, England. They held me in a sort of holding cell for immigrants and suspicious people, for almost 4 hours, until they finally let me use my own tablet computer to look up my itinerary in my e-mail.
If this matters, I am Jewish according to heritage but I am reformed or secular - I don't observe the religion, I don't wear a yarmulka or any sort of distinctive costume. I am not sure whether I look like a suspicious middle eastern person - my ancestors who came to USA actually were from Lithuania, Latvia, and Belarus.
Mainly I want to know my chances of having the same sort of difficult getting the boarder control agents to stamp my passport or worse, if I travel to Italy. Is just printing the information from the website I buy my tickets from enough? Should I contact the US embassy in Italy? Is there any chance that border control agents in Italy are prejudiced or oversuspicious of single men traveling alone? Should I just acuqiesce to only traveling with a Rick Steves tour or other organized tour group?