alt Hacker News> Definition of language is not up to you but society in the aggregate
Sure. The definition of propaganda OP uses is an internet niche one to mean any broadly-held (and thus disseminated) theory one disagrees with.
The argument against co-equal branches is a legitimate one. Calling the theory propaganda cheapens a real argument by making it look childish.
propaganda /prŏp″ə-găn′də/
noun The systematic propagation of a doctrine or cause or of information reflecting the views and interests of those advocating such a doctrine or cause.
...my use seems to fit the definition to me.
You are applying personal emotional bias to a very plain stated definition.