...that "amused" jerk is a lot more pretentious. 
He changes his damned nick to look smart or 
shocked or whatever about what the previous 
poster wrote. Writing "amused" as a name to 
answer yours is IMNSHO damned pretentious, I 
mean, what's amusing about asking a logical 
question and having a sensei-name? That jerk 
feels better than many of us, he not only dare to 
piss me off more than my dog does (which isn't 
possible for a mortal - so he think's he's beyond 
us mortals as well!).

Look, it's just a yellow-bellied brainless pile 
of dung hiding behind smartass remarks and no 
name at all. I also change nicks sometimes, but I 
keep myself identifiable because I'm NOT as 
fornicating low as to hide when I say something.
*makes the yankee dance*

Sensei ain't pretentious unless you chose the 
name with the feeling of needing to teach us all 
like some preacher. 
Just like my Ore-sama. To me, it stands for "Try 
and break/bend ME!" and for I don't run with the 
mass only because some find it important to fit 
in. It also represents my behaviour on street 
like when perves address me. Plus, I feel great 
being myself. 
Plus, the "ore" comes from my male half. I don't 
really like girls/women and I feel more at ease 
in male company, plus I have quite a man's 
manners (and I'm not talking gentlemen here). So, 
yes, ore stands for my mental man half and sama 
for "bruised, not broken"/selfesteem.
(meaning, nobody here needs to take offense from 
Ore-sama unless anybody plans to break me...)

(and like Tohru-kun I drifted, sorry..)
My point is - a name like sensei or Ore-sama is 
not pretentious as long as you don't mean to pee 
higher than someone who doesn't try to make you 
pee lower (dogs decide about ranks by how high 
they pee. Many dogs stand on their front legs in 
order to pee as high as gets...). 

Aaaand, as I also say at the pet forum.... some 
anonymous unIDable jerk's opinion is absolutely 
invalid, BECAUSE opinions must be spoken in order 
to be valid, BUT not IDfying yourself and 
remaining unknown makes you a GHOST and GHOSTS 
cannot talk as they don't exist and a nonexisting 
person cannot say anything valid, because it just 
doesn't exist ;)

And a word to the jerk, if you're not too scared 
to stand by what you think and say which is only 
normal, choose a name and keep it, darnit.
You also don't post any email address cuz you're 
too damn scared to receive backfire. Meaning, you 
knowingly only post in order to peeve, hurt and 
to provoke, cowardly hiding behind no ID and 
smartass N/T talk. Who's your daddy!

After a long rant, I will now re-dedicate myself 
to my manga...
Ore-sama