Exactly,

It's why it does my head in when they describe referees as incompetent as if they don't know what they're doing.

They know exactly what they're doing. It's blatant bias and needs calling out by someone at a high level.

Lampard saw it with the Rodri handball v City and the blatant pen we should have had in the anfield derby that year.

They make the rules just ambiguous enough that they can rationalise a decision however they want it to go.