WASHINGTON – Maxwell Frost has not been shy about criticizing Joe Biden’s administration – from climate change to border policy to Israel’s war in Gaza. But the nation’s first Gen Z congressman has nevertheless seen his profile inside the Democratic Party rise. And despite Frost’s concerns, the 27-year-old Floridian is becoming an increasingly essential surrogate for the 81-year-old Biden. To Frost, that push and pull is part of any relationship, and he doesn’t know why it should be any different in politics. “I just refuse to fall for this, ‘I hate you or I love you thing,’” Frost said in an …