Harry, Snape and Dementors WAS: Re: CHAPTER Chamber of Secrets Chapter 18:

[pippin_999]

No: HPFGUIDX 189363

 
> Potioncat:
> <SNIP>
> We don't know if Snape himself compared the two methods or simply taught one. 
> 
> Alla:
> 
> I disgree. To me disagreeing with Snape's method is a clear indication that he only taught one. He does not say he disagreed with method that Snape preferred. IMO.
> 

Pippin:
Canon says that Harry disagreed with Snape about the "best way  to tackle dementors." HBP ch 21.  That does imply disagreeing with the method Snape preferred.

It is also not true to say that canon never discusses other methods.

Some are not recommended: 

"Dementors are not to be fooled by tricks or disguises" says Dumbledore (POA ch 5). 

But a few desperate individuals succeed against the odds. Sirius uses his animagus form and its simpler thoughts both to protect his sanity and to escape Azkaban. 

The Crouch family succeeds  with a daring substitution. "The dementors are blind. They sensed one healthy, one dying person entering Azkaban. They sensed one healthy, one dying person leaving it." -GoF ch 35.

Sirius has another method as well.
"I think the only reason I never lost my mind is that I knew I was innocent. That wasn't a happy thought, so the dementors couldn't suck it out of me...but it kept me sane and knowing who I am...helped me keep my powers" POA ch 19

This seems similar to what Harry does in DH ch 36.

"And now a chill settled over them where they stood and Harry heard the rasping breath of the dementors that patrolled the outer trees. They would not affect him now. The fact of his own survival burned inside him, a talisman against them, as though his father's stag kept guardian in his heart."

We see there are thoughts are so powerful that they can protect a person from dementors, even without a wand. I can certainly imagine that would appeal to Snape, who disdains foolish wand-waving. If that was the method that Snape recommended, it was unwise of Harry to disdain it, and if he got a low grade then perhaps it was deserved. Especially as he had seen it demonstrated by Bella, who seems completely unaffected by the dementors who surround her at her trial.

Alla:
> Pippin, you just commented in the post that I responded to that Harry wrote the essay on such important topic for him  that saved his life and life his loved one with the only purpose in mind to annoy Severus Snape, but Harry would not have commented if he got a good grade on it. Really?
>

Pippin:
I don't think Harry wrote only to annoy Snape. I think he undertook a "viciously difficult" assignment with enthusiasm because he was passionate about the subject. But he knew that Snape would view any disagreement from him as cheek and he chose to do it even so. 

Note that Harry is not at all worried about what a bad grade will do to his reputation as a DADA expert, in contrast to his fears that messing up the antidote assignment will be the end of his reputation as a potions genius. So I don't think his grade mattered to him all that much, and he probably forgot it about it as soon as he'd handed the thing in. 
 

Pippin