alt Hacker NewsFiltering is a valid form of improving signals. If there there was a reliable heuristic for users posting low effort content that was better then the user would be considering that instead.
If someone in a chatroom for example is being spammy with their messages at the expense of noticing posts one finds more relevant then blocking them isn't due to considering them some filthy pleb but improving their experience. If the user being filtered never becomes aware there's no reason to be offended, either.
Edit: also I wasn't the one to downvote you if that makes any difference.
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My system has been working pretty well: using some extension or another that has mute functionality, if I see a person post an extremely low quality comment, I look at their comment history for two or three pages. If there is no comment of value in that set, I mute the user. The board gets better each day.
HN is already heavily moderated. Low-effort posters and spammers get downranked immediately, based on their behavior. OP is simply intolerant and unable to function in a social setting.
Minimum karma and account age filters are discriminatory, anti-social features that should not exist on any social site. The people asking for such features are intolerant jerks, no different from ageists or ableists. They are parasites, because they want the people who are not intolerant jerks to do their filtering for them, and keep the site alive by doing so.
What would happen if every single user enabled their minimum karma filter?