I don't expect pro athletes to be particularly rational during an all out effort, or right after it. Even less if they are a few months removed from being teenagers.
And I'm pretty sure he would have looked a lot sillier if he had hit his handlebars with 20 something km to go while the race was still on...
That was of course said like some kind of a joke...
We have seen riders doing that quite often, but most usually when they make some big mistake at the finish, or lose by a slim margin, start sprint too late/too early and that kind of stuff...
And we have this situation, where probably even Evenepoel's parents knew he will not win, yet he's angry like something went wrong, like he should've won that easily, but somehow he lost.
To me, it looked kind of silly, to tell you the truth.