NEW YORK — Fans received orange towels Friday as they entered Citi Field. “I’m gonna wave it until I break my arm,” a man in a personalized Mets jersey said as he exited an elevator an hour before first pitch. Some 40,000 people did just that early in the evening. Autumn in New York and The Amazins in the postseason for the first time since 2016 is quite a scene. Until the Padres hit four home runs in the first five innings on their way to a 7-1 victory and Mets fans turn on one of their star pitchers and their team and begin to boo every move for a time and fight in the stands and eventually …