Yeah, the first reraise is questionable and the all-in is a really poor play, I think. If you're raised on a four flush board, you should play carefully with anything less than the nut flush, since any decent player would be reluctant to raise with anything less (unless on a bluff).

I think the dual case of him being willing not only to raise without the ace, but also to be willing to call huge reraises without it is so unlikely that this is definitely a losing play. You're lucky this guy is a dumbass.