The reason I am down voting this particular comment is because it is repetitive, off-topic, and diminishes the community.
As to your complaint, NO not all posts are not getting downvoted. The “Hi,” “I just copied the post before me,” “Pro Wrestling,” and “Random Irrelevant Fact” posts are pretty aggressively downvoted because they do not belong in this community (many of them do bot belong anywhere IMO).
In terms of posting here, think “High Culture,” “Street Culture,” “Art,” Deep Dives,” and challenging or enriching “Think Pieces.” While I am not an Admin here, that is my take. When in doubt, read the tags and descriptions at the side of a community. So NO not everything gets down voted, but YES I personally will keep nuking irrelevant or off-topic junk.