I don't really do endgame content, but believe this is where the majority of the toxic community exists. So I honestly don't encounter these players very often. Once in awhile though, some of these players make their way into DF and keep their raiding expectations of other players intact.

A growing player base also means more toxic players. Then there is also the fact that many players are maxed out, and chomping at the bit for the expansion. The fuses on these players, is rather short.

Add it up and you get encounters with toxic players at a higher frequency. And the longer you've been playing, the more you're going to notice the community is not as it was when you started.