It's a fairly standard usage which is universal, and it means I aggree
with the person completely. It is even taught at the universities
communications departments. Ideas and thoughts can change from person
to person. You may see that irritating, and I may see the quoting
irritating, so what? Will this be a real reason for us to be bad to
each other? No, we can share lot's of knowledge and have fun. Internet
is a virtual place, we can not be sure how the other person's emotions
were when he or she was typing the sentences. Maybe I was so keen on
aggreeing and I was actually happy when I typed that? Why take offence?
And I know how to use servers and forums as in my 15 years of
experience I have never been banned from any place, as I always try to
share and communicate with people, not to insult them.

With all my respects,

Best Regards,

Aydin