Dumbledore wore high healed boots, long purple cloaks, had a pair of earmuffs, liked reading knitting paterns and his fave words were nitwit, blubbler, oddment and tweak, he was so gay i don't know how I didn't notice before!
It doesn't make a difference to me who Dumbledore fancied when he was younger, the relationship he had with Grindewald and his experiences as a young man were what made him the person he was and I wouldn't change a thing about him.
JK only told everyone about Dumbledore's sexuality because a fan asked her a direct question during the book tour and she had no reason not to tell the truth. She had always thought that Dumbledore was gay but it had never been discussed before and there was no reason for it to have been bought up in the books previously.