no I haven't found one piece of evidence, he was straight.
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Jack merridew! Jack merridew!
Jack made that statement when his call for a vote of no confidence in Ralph's leadership was ignored by the rest of the boys.
At first Jack cannot kill. This shows that Jack is not entirely evil in the beginning. Roger, on the other hand, is pure evil. Jack's weakness is that he doesn't consider anyone else's feelings or oppinions, he is extremely self centred and thinks only his own viewpoint has any merit.
Jack gains more of a following because he appeals to most of the boys' sense of fun and not doing work, liberation, and of course food, especially meat.
Jack doesn't allude to any of the boys as being 'odd' in chapter three. Ralph says of Simon, "He's queer. He's funny." Jack merely nods in agreement, as the book says, "as much for the sake of agreeing as anything."