Don't ignore your feelings. You should get pissed, and also understand the forces at play. Not everyone you work with will have an equal or greater work ethic

Don't ignore your feelings. You should get pissed, and also understand the forces at play. Not everyone you work with will have an equal or greater work ethic as yours. The harder you work, and the better you become at your work, the more apparent it will become development in many companies is less than ideal. And that's ok. You'll be happier if you understand that. You went on to dig deeper as a result of getting annoyed, which people who blindly succumb may not have done, and may lead to changes. But please, stay focused on the bug, not the person. Address the process, not the person. The process is a stronger force. One of the most effective ways to handle cases like this is to face the problem directly. In your case it may have been to send an email, containing only one sentence and nothing else (so there are no distractions) that says "I believe the problem is with scopes in compute_since_how_long -- can you please test this function?"