That's an important lesson, but as devs mature they probably shouldn't react like that.

Ideally you want to be able to keep your head on straight and obviously it's easier to work harder for someone who 'believes in you' ... but that's a bit emotive. Just do a good job, be professional, expect the same knowing you're not always going to get it and that's that.

Instead of someone 'going to bat' you really want someone who's just communicating and helping you create the outcomes necessary.