What is way more toxic, are people who consider themselves brilliant loners, because they've just implemented a web server using only Python's list comprehensions. And that is surely evidence of their unbridled genius. You know, people who are decent enough programmers, but are so egocentric in their work, that it borders on being inconsiderate.
For example, I used to work in a team where we wrote a lot of Python. We were three and one guy out of us considered himself above PEP-8 (he was good on the SW subject matter and was tight with the manager, so that went on unchecked). For example, all indents were done with 2 spaces. Meaning when some of us had to fix or change his code we had to fight our editors/IDEs. We ended up autopeping his files by default and ignoring any complaints.