They're saying that the right thing to do is accept insults or ideas that go against your principles and stfu. SJWs and PC culture are to be tolerated because they come from the team which brings us some good ideas.
Imagine telling people to stfu about the environment and WNs because they generally play for the same team that values a nuclear family and small government.
There are legit fucking idiots, on both sides, unwilling to recognize, condemn, and root out problem individuals just because they bolster their army's numbers. They don't understand that tolerating such behaviour undermines their legitimacy and alienates those who tend to think independently.
These people think that "both sides" is an illegitimate concept.