I've seen it happen here actually. Occasionally a thread will come up on Reddit of people looking for alternatives and HN inevitably gets mentioned. Then there's a flood of people posting idiotic comments and memes on the posts here.

Thankfully due to the efforts of the longer-standing community this stuff ends up languishing at the bottom of the comment threads but it seems like it's only a matter of time. It's certainly become a lot more prevalent over the course of the 5 years that I've been here.