Second opinion:
I can see why there's some concern over this, but I'm going to uphold Farnhamia's warning.
Calling someone a hypocrite is not flaming. My colleague has likely warned because of the addition of the 'fucking'; 'fucking hypocrite' moves it out of strong observation territory and into potential flaming, depending on context.
Given the heated nature of thread, I think holding participants to a stricter standard is warranted; this is hardly unprecedented. It's a judgement call, but I see no reason to second guess Farnhamia's judgement on this one.