The reason I hate it is because it implies that there is such thing as "the truth", and that they somehow have the authority to decide, globally, what is and is not truth. Truth is, and always will be, unknowable, at least in an absolute sense. Depending on the sensory data we have as individuals, we may assign probabilities to certain predicates, and we consider them "true" as much as our observations correspond to our expectations derived from those predicates.
The "disinformation" crusade could spend their time much better trying to share the information - i.e. educating people. But no, education is expensive and hard. It's much easier to ride the high horse and censor anyone who disagrees with them...ahem, I mean "spreads disinformation". Feels so righteous too!