What isn't countenancable is the use of language of any sort designed to make the writer look clever. It never works. And I have to say, I don't often see it here...
Countenancable? Is that a word in the real world??
Most people would just say that the use of particular language isn't 'acceptable'.
Google search for 'countenancable' = 4 results (all somewhat dubious sources)
Google search for 'acceptable' = 12,050,000,000 results
Please let's use words which promote communication rather than hinder it.