Yep, and this is another example of the huge clash of cultures here on bitcointalk. The people who use "sir" when applying for a sig campaign or asking for their well-deserved feedback to be removed are not just being polite. They will say anything to get a spot in that campaign or to get a red trust rescinded, and the constant "sir" is just an extension of being disingenuous.
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That is much, much different than what we usually see on bitcointalk--and no matter how many times this gets pointed out, they still keep writing it.
Users in the forum, especially lower-ranked ones, tend to over-use "Sir, Mr., etc" as the way they thought effectively to beg for merits, campaigns, etc.
I don't see reasons to call someone I don't know, have not met before in real-life situation with Sir, Mr., etc.