It is either the case that the parent likes to add random facts into conversations such as "the word communist contains 9 letters" which has nothing to do with the conversation, or the parent clearly felt that the phrase being perjorative was tied to it being censored.
Let us assume the parent was being on topic and relevant. Therefore they seem to indicate the censoring was due to it being perjorative. As most other perjoratives are not typically censored (per my comment), that would imply that the "Communist Bandit" perjorative is somehow special.
Is it special because it's somehow especially worse than other perjoratives, or is it special because it offends a foreign state's political party?