The Life of Brian joke is about the Trotskyist groups in Britain, who couldn’t seem to be able to have a meeting without splitting over whether they should have tea or coffee, then would have further splits over what kind of biscuit to have with it. There are currently 16 different Trotskyist parties and groups in the UK (not counting the Irish parties active in Northern Ireland).
On the other hand, the differences between Marxism-Leninism and libertarian socialism can be a matter of life and death, almost always the MLs life and the libsocs death. My distrust of MLs is not a trivial matter, it really is a scorpion and the frog situation.