They definitely are...Trump said this in a tweet, Dems are actually supporting Greens with the recount nonsense. What happened to Hillary's "let's move on and give Donald a chance"?
The Clinton camp did indeed say that they thoroughly went over the results and found no evidence of mischievous behavior or any other reasons that would indicate the count was wrong. The reason they jumped in on this was that because Stein was doing this regardless of what Clinton's campaign did, they (CC) might as well get involved to make sure the recount is conducted properly. It's going to happen with or without them, so there is no benefit to staying out of it.
I don't see what the problem is here. If Republicans are mad about the recount, it shouldn't be at the Clinton campaign or the Democratic Party. Neither Clinton nor the party initiated this recount, and not all us lowly voters/supporters think there is a point in having a recount either.