You're being really ungenerous here, saying their bug tracking system is "broken", their use of it is "elitist", they "don't care about bug reports" and they're guilty of "arrogance". I don't think you can substantiate any of this just from the fact that they use Trac.

You (well, maybe not you, but one) can also imagine all kinds of counter-arguments (not that I know if any of these are true or not):

- Devs would rather spend their time on development

- No one is inspired to move the system over

- They have automations or conventions built on Trac

- Their super users (prolific users, testers, and engineers) are all used to Trac

- People use RSS feeds (Trac has lots of RSS feeds) to stay informed or build other tools, which would all have to be migrated and might have incompatible formats

I encourage you to be more open-minded about the way others choose to work. We shouldn't overemphasize homogeneity in work processes. I also encourage you to be more generous with the words you choose.