so are you implying that we do not use rude words because we wear masks?

why? what should I know about you? what do others know about you that I do not know?

Ne demek şimdi bu?

Is there any different between:

1)Nerede otuyor bilmiyorum.
 
2)Nerede oturduğunu bilmiyorum.

3)Nerede oturmuş olduğunu bilmiyorum?

The first two is okay,but the problem is in the third one.

That´s like I don´t know where he had lived?

Biggest problem here is that I don´t know usage of this tense even in English. 

Probably I was sleeping that day at school.  

NO.

"asshole" is a very bad word 

Now, whatever you will say about yourself will be falsified because of this.

yep, maybe gokuyum. 

People should retire one day when they ask this question to themselves.

The two expressions both indicate that boys and girls are together, with a small fine difference.

"kızlarla erkekler oturuyor"  may be used to describe girls and boys sharing the same auditorium, but possibly,  say with girls at front rows and boys in the back rows.

"kızlı erkekli oturuyorlar" indicates mixed company in the auditorium, no segregation...

but i think it is just exceptional idiomatic common usage. because you always say:

- Sana bir şey söylücem. (not "bir şeyi")

- Bir şey yapmamız lazım.

But it deserves a more extensive research.

Oh, and is it not "offensive" that you keep on repeating the word "perfect" while no one has ever claimed that everything MUST be "perfect"?

Diagnosing someone with obsessiveness is also a little bit strange. Are you a psychiatrist? It may "offend" people to see someone in a wheelchair. What are you going to do? Smash the wheelchair into pieces?