Huh, this is new: Stack Exchange has rolled out a kind of "new contributor" badge with some text reminding you to be nice. Newbies sometimes violate unspoken rules or are unaware of meta-knowledge (e.g. big/ambitious questions on PCG are developed in the sandbox), might help.
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Love this kind of thing, thanks for highlighting it! It's always great to see folks helping us to be better humans through good design. 👏