With anti-tourism protests heating up in popular destinations across Europe, many visitors are increasingly at pains to fly under the radar. But short of ditching your safari hat and sock-sandal combo, how can you blend in with the locals? There are tonnes of tourist no-nos that could rub residents and fellow travellers up the wrong way. Here are some of the gravest offences, according to users of Reddit’s r/travel forum. Don’t use destinations as your modelling backdropFrom Japan’s Mount Fuji Lawson to a lake in Austria which inspired the ‘Frozen’ movie, picturesque tourist hotspots have gone…