As long as there is no system of autohiding/removing posts that receive too many downvotes, it is ultimately meaningless. Anytime certain topics like China would come up on reddit, outside a couple specific communities, I got ready to get massively downvoted for disagreeing with the "china bad" circlejerk.
No real reason to let it bother you, and if anything I find it amusing when I notice I got an extra downvote on every post in my post history after I post something about communism. Like guy has nothing better to do than to go through my post history downvoting me.
It is always pretty funny when you post something that gets 20+ downvotes and not a single person replying about the actual content of what you said. Which tends to not happen here. You will usually get people at least engaging you even if you are parroting mainstream liberal talking points.