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What are your opinions on Mr. Barkin?
Barkin shouldn't be an educator. Or allowed to be in charge of children.
He runs the school like it's the military.
He admitted to disliking Ron since Ron gave him a weird look in the ninth grade.
He assigns extra homework to Ron just because he can.
He refused to let Ron specifically leave the classroom at the bell despite letting everyone else go just so he could assign him extra homework for no reason.
And demanded that the homework be on his desk at 7:00 despite the school not being unlocked until 7:30.
And gave Ron more homework for pointing out that they don't unlock the doors until 7:30.
He took a whole letter grade off of Ron's assignment in "Ron The Man" just because Ron's bar mitzvah certificate hadn't been signed.
(If Barkin wasn't grading most of Ron's assignments, do you think Ron's grades might be higher?)
He humiliated Bonnie at graduation when she didn't deserve it.
(Seriously, Bonnie's squabbles with Kim and Ron are not something Barkin should be humiliating her for. The punishment was disproportionate to the "crime".)
And the one time anyone's in actual danger, he completely panics.
That being said, he also praised Ron's personal hero essay.
And was proud of Ron's impressive culinary skills.
Let Ron take charge in "Sink or Swim".
And had no problems assigning detention to Kim when she had deserved it.
Barkin mentions in "Graduation" that Ron reminds him a bit of himself, so Barkin is probably trying to prepare Ron for the things Barkin's faced. It just isn't having the desired affect.
I think that Barkin genuinely cares about the students, even Ron, but is in no way qualified to care for them.
Truly, I don't think Barkin is a completely irredeemable person, but he clearly has issues to work out, as shown in "Fashion Victim" by his break from reality, and needs to fix those before he's placed in charge of anyone ever again. If he's ever placed in charge of anyone again.
Okay, I'm going to say it: as horrible as Bonnie was throughout the series, she didn't deserve that kind of humiliation at graduation.
First of all, Barkin should know how to contact Bonnie, or her mother, to let them know before the ceremony that Bonnie wouldn't be graduating.
Second of all, the one test that Bonnie missed should not be weighted enough to cause Bonnie to not graduate. Especially when she was apparently a Salutatorian. (Second highest GPA in the class, she tied with Kim for the title.) At worst, she loses the Salutatorian title, but not flunk completely.
Third of all, the reason nothing happens in the last week of school is because the grade books are closed, and no assignment given after that point is actually counted towards their grade. So even though Bonnie missed that pop quiz, it shouldn't have mattered anyways.
Unless Barkin was breaking the rules, which wouldn't surprise me.
So, it seems the only reason Bonnie was told at the ceremony that she wouldn't be graduating is because Barkin decided he wanted to publicly humiliate Bonnie.
And a 40+ year old adult wanting to humiliate a barely legal former student of his seems wrong.
(Note: I don't think there was anything sexual behind his motivation for humiliating Bonnie, but it still seems wrong.)
Especially when the humiliation seems disproportionate to any slight she might have done to "deserve" it.
For all Bonnie's done to embarrass and antagonize Kim and Ron, she never goes public with it.
The closest we get is in "Hidden Talent" when she shows a video of Kim failing to hit the high notes while singing to hurt Kim's confidence, but Kim and Ron are the only ones around at the time to see the video. It doesn't count as "public humiliation".
So it doesn't seem right to humiliate her in such a way when she never stooped to that level herself.