You can try acknowledging that people have actual differences of opinion instead of referring to different ideological tendencies as a result of poor understanding. Doesn’t really help your cause to always come across as pretentious and arrogant, even to people who would otherwise be your allies.
To give an example, I disagree on this. Now, if you were to approach this discussion under the pretense that my disagreement is based on poor understanding of history or of theory, that would be pretentious, and therefore unproductive if you actually want to change my mind. Instead, keep an open mind and be willing to entertain an alternative perspective.
In my opinion, the Bolsheviks were oppurtunists who co-opted the revolutionary fervor in order to centralize power and influence in the movement under their control. They did indeed use Marxist theory to guide and justify their actions, but that doesn’t make it right. I understand that Marxist theory advocates for the centralization of power and control, I just disagree with it, which is a view more in line with Trotskyites than Marxist-Leninists.
I’m not trying to say that you are particularly arrogant or pretentious, but Marx and especially Lenin certainly were, and that is reflected in their work.