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The term was originally needed in the context of warring factions of Sam girls vs. Dean girls. However, some time after the character of Castiel was introduced and fandom had migrated to tumblr, the ship war between Wincest and Destiel shippers became a more pressing issue (to the point where some newer fans didn't even know that fans of the past had liked only one brother). It appears that Destiel shippers (or possibly some bibros themselves) started using the term in a more negative sense, defining bibros as fans of Sam and Dean but not Castiel or equating them with anti-Destiel fans.
Some bibros on Tumblr have complained about this:
I’m really getting irritated by the use of the term “bibros” by some Destiel shippers. It does NOT mean someone who hates Cas or Misha. It has nothing to do with him. It means someone who loves both brothers equally. It has meant that since the show started when there were Sam fans and Dean fans.
However, some statements made by self-described bibros on tumblr do indicate they are not fond of Castiel's popularity:
So people hate bibro fans because we watch the show for the 2 brothers the show is about ? Not an ensemble cast ? The show is about Sam and Dean . There’s other characters obviously . But all plots involving other characters mostly always circle back to Sam and Dean ? That’s why for conventions just Jared and Jensen have their panel the last day . If it was a ensemble cast or if there were 3 lead characters ..wouldn’t they be in every episode with them and with them for their panel ?
During a 2016 tumblr discussion about the "true" meaning of bibro, winjennster explained:
When the term bibro was created, it was created to indicate that someone was a fan of both brothers. At the time, there was a war between the Samgirls and the Deangirls, so if you were a bibro, you were a non-combatant. Unfortunately, some bibros then decided to use the term to indicate that they hate Cas, which is how the term became the derogatory it is now. At it’s heart and origin, being a bibro was a good thing once upon a time.
- Bibro entry at Super-Wiki
- Super-wiki entry
- 5 April 2016 tumblr reblog by winjennster
- "i didn’t know it means people who just like the brothers because in that case, are we all bibros? i mean what is the point of watching spn if you don’t like the brothers? (ship or not) So why call ourselves bibros if being a spn fan means that anyway?" 5 April 2016 tumblr reblog by spockette11a2b.
- tumblr post by samanddeanunited, September 11, 2015.
- tumblr post by hello-nicolexoxo-love, September 3, 2015