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Sir isn't needed in any way. No one here is a "sir". We are random internet users that have gathered on a forum to discuss Bitcoin.
I addressed such a situation in my last paragraph in the quoted. If I met any user I addressed as Sir in reality online I won't lose my respect for them by dropping that appendage. I will still address then as sir. It's part of the African culture. We hardly address older people by their first names like they do in Europe. "Sir" is often used in a formal setting for someone you know is older or an office boss. I've people use it on me a lot, especially those I tutor and mentor. I've yo confess that this gets uncomfortable for me too whenever age mates or those older than I am use it. Even when you get to tell them to drop it; some still revert to using it.
If we are all equal, why are you giving my a title because I am white and you make it sound like I am better than you?
In Africa, the "Sir" is not like a title as they have it in Europe with the Knight stuff. And nope, it has got nothing to do with your race as white. It's a cultural practice in Africa as a mark of respect, not of fear. The same person saying "sir" to you can also show you "strong thing" when you mess around them or overreach yourself if you think they're timid. Saying "Sir" isn't a sign of weakness in anyway. While I can easily pass off non-eye contact thing as timidness, certainly not the use of "Sir".