I agree with what WeJo said earlier. It's important that we don't only ever read sanitized, corporatized, anodyne and ultimately worthless literature about track and in this respect LR performs a very useful function.
This intense focus on Webb and his actions exists for one reason. He is - still - the greatest US track talent at any distance over 400m. Almost everyone reading this thread and WeJo's coverage agrees with this, and they demonstrate so by their actions including participating here.
Webb may not have covered himself in glory but he did nothing egregious. People - athletes - are not automatons. Even Valeri Borzov stated so.
Webb has a chance, however small, to win an Olympic mid-D gold medal. Most likely at 5k if he realizes this or not. Anyway, everyone else in that Boston race, or in these conversations, does not. That may be unfair, perhaps, but the comparative volume of coverage of Webb vs the rest tells us this.
I'm not saying his response was an impressive demonstration of self-control. But really, who are we to judge him? He knows the weight of expectations. He's very dissatisfied with that run and that's good, he's fired up to do better.
It's certainly possible he might do better in the long run if he could channel and direct his emotions, mastering his own responses to these situations and analyze carefully what went wrong, and probably into mediating his training program with his coach if he has that much doubt in it. But none of this can be done trackside after a disappointing performance like this.
I think he would do better to be advised by someone like Sebastian Coe, a proven multiple Olympic champion with a set of PRs at shorter distances very similar to Webb, or Said Aouita, the same but with a focus on the longer distances. Salazar ran some good marathon and 10k races. BUT. What does Salazar know of a 3:46 mile, or especially a 1:43 800? What does Salazar know about Olympic and World Championship success?
Let's give Webb a break. Webb's talent deserves to be maximized. None of us - importantly, including Webb himself - think he's accomplished that yet. Some of us still think his 3:53 HS mile is his current career moment. But we hope that won't be how he ends his career. He hopes so too.