Unfortunately the biggest part is, there’s kind of 2 definitions of bias at this point.

There’s the older, what I’d consider should be the truer form where bias is about taking a side or leaning the interpretation of the established facts on things that don’t have a 100% perfect consistant answer. IE Sportsball team A is better than sportsball team B, when obviously every part of that equasion is a dynamic, every player has good and bad days. good and bad weather conditions etc… who they’ve played against and how good they are etc…

Same for political concepts where at the very least it’s worth noting there’s no agreed upon by all of political science good and bad with regards to ideas etc…

Then you’ve got the type B bias where… well one side is outright denying the objective facts. Going to the sportsball analogy, that’s like one side says “Team A won 900 to 0 against team B”, while fans of team B go “look the game’s score is right here… team b won 52-20”. and they call you bias for trusting the sportsball leagues official scores, and the game that aired on national television, over the word of team A’s number one fan.