While it didn't happen for the topic of FPH, my subjective experience is that it _did_ happen for racism. I've mostly been subscribed to smaller subreddits for about 5 years, and while the likes of r/European and r/coontown were at their peak, there wasn't the constant stream of insinuations about immigrants or outright racism at the low (and sometimes not so low) end in subreddits like r/Ireland or r/Europe there is now.