RedMarx OP wrote

It certainly is an insult, one which the liberals are more than willing to bear so long as they can continue to pose as 'lesser-evil' or 'good cop' which is precisely what calling them "fair-weather friend" and "treacherous ally" perpetuates.

It's not so much that they claim not to have answers that makes them "tone-deaf" but the fact that they can not see the answers that have already been put forward in the real existing class struggle.