That's a reputation it had in the 90s to early 00s and has long since lost. Even in recent years the drama within Debian has been incredibly high.
A lot happened in debian-private, despite "We will not hide problems" being part of the project's social contract, and then leaks started happening and all hell broke loose. I didn't even mention the decade-long community censorship campaign yet. Or the Volunteer Day suicide. Or the "Please write a list of 5 Debian Developers you would like to kick out of the project." DPL election question. Or banning Linus from DebConf...
A lot happened in debian-private, despite "We will not hide problems" being part of the project's social contract, and then leaks started happening and all hell broke loose. I didn't even mention the decade-long community censorship campaign yet. Or the Volunteer Day suicide. Or the "Please write a list of 5 Debian Developers you would like to kick out of the project." DPL election question. Or banning Linus from DebConf...