OTDers are willing to state things publically that people tend to whisper. You think things like too many Chumras only bother OTDers?
They bother people who are frum too and they talk about it quietly.
OTDers complain about Chinuch, we have all heard the whispers about the lousy chinuch.
You can moan and groan about people going OTD , or you can do something , and something is listening to Chizuk from them. They do have real criticms, some of it of course is sour grapes, but not all of it is and its not very hard to figure out which is sour grapes and which is real and needed critism.