Depends what you're looking for. If you mean young men expressing anger in toxic ways, then yes there are fewer avenues to do that than a few decades ago, and rightly so.
But for young men whose anger isn't that of a shithead? Hell no. Obviously hip hop is a huge outlet - and Bono's comment implying it's not really for young white dudes is very strange, given all the white dudes rapping or at hip hop shows.
Metal is, of course, thriving across the planet. And the genres birthed from punk are big, especially metalcore and its derivatives, but also hardcore and post-hardcore. Emo has experienced a big resurgence in recent years; maybe there's a stereotype that's for sad young guys but it's also a good scene to channel anger in a healthy way. And if you've got some real bleak social alienation you don't have to go far to find a noise scene, and the misogynistic or racist noise artists of old are increasingly being confined to a narrow corner.
Of course each genre has problems with meathead fuckwits. In my experience those are usually regional scenes rather than genre scenes (so that a death metal scene in one city might be pretty healthy, but in another will feel threatening if you're not one of the boys). But there's plenty of effort being made so that everybody feels able to express themselves and their emotions without pushing out others who just want to have fun with a bit of musical catharsis.
And, to be honest, a lot of the angry young dudes who two decades ago you'd have seen at nu-metal shows or wearing a Limp Bizkit shirt, they now seem to be thrashing around at EDM festivals in shitty singlets.
Can you provide data showing by what metrics metal is "thriving across the planet"? Because here in the US, all types of metal seem very confined to smaller and smaller subgroups and having less and less of impact on the general populace over the past 20 years. The charts appear to bear that out, which is really the point that Bono was making.
Metal is almost nowhere to be seen when in comes to top albums, top songs, and top tours in the US. Most metal musicians that I have seen are struggling to fill anything other than the smallest venues. The overall impact of metal in the US right now would appear to be negligible, and that's being kind.
Nice of you to take a big swing and miss at EDM as well.