What a strange comment.
The paths and cognitions of the different yanas are marketed as different.
They clearly are not marketed as being all the same.
Unless one has realised all of the different paths how can there not be sectarianism?....providing it is non violent it seems fine.
There is an obvious difference between:
a/ Recognising difference between paths, traditions, lineages, philosophies, methods etc, and treating that difference with precision, care and compassion.
b/ Gleefully rejoicing in those differences and subtly (or not so subtly) ridiculing those who are on a different path or who hold a different view.
It's oh so common and oh so passe, fruitless, boring and unwholesome to practice b/ - and on these kinds of threads, b/ always tends to emerge at some point.