Why do women keep calling me "sir" lately?

I've seen this fad before only it used to be to call me "bro" and lately it has turned into "sir"... is this some sort of new derogatory term towards men I'm unaware of? Is this the new way of looking down one's nose at a male?

If you know the answer, any thoughts on what starts these 'name calling' sort of trends?
Updates
+1 y
The "because of you're age" answer doesn't make much since or it would've been happening last week as well. It's only here on gag as well. Thanks for trying to help though.

Honestly, I think I just have a new gag stalker... one I've already blocked, but she must have multiple accounts (obviously). The writing and argument styles line up a bit too much... way too much. ... yet another one.
Updates
+1 y
Saggy orangutan titties having pancake butt that I wouldn't look twice at needs to grow the fuck up. She just wants what she can't have.
Why do women keep calling me "sir" lately?
Post Opinion