I've noticed that as well. I've been posting here, and pretty much just reading at the "other" forum(s).
Not that the other places are so bad to chase me away, but I've been on one as long as longer than here, and the whole tone of the forum has changed over the years. Snarkiness is almost rampant. Some of the people that were the most helpful left because of the changes.
Last picture I posted for C&C at another forum was slightly over-saturated. I mentioned that, and that I had learned about how to properly expose that type of photo (sunset silhouette) and would make corrections on the next attempt, and asked for any other suggestions and comments. Only posts to my thread were "Your exposure sucks", "It sucks because it's over-saturated", etc... not one comment about subject matter, composition, presentation, or shooting tips.
I actually received helpful critique on a C&C request here.