I apologize for saying you were rude. I re-read your post and concluded it was aimed at the teachers, not the students (as you write yourself). I edited it before you replied.
As for who has to find proof of what: I'm really not interested in making this into an argument. I was hoping you had a link to back up your claim - so far all I've seen or heard to support your claim are your own words. Even if the onus is on me, it would be great if you had a link lying around or could point me in the right direction, thanks.
Any chance the grammatical rule for the word "its" has been changed since the 90's? Grammar and spelling does change once in a while. Perhaps "woot" will be added to the Advanced Learner's Dictionary at some point