Those words are bandied around quite a bit, true. That said I would not say they have lost as much meaning as the ones thrown around by "progressives", i.e. the ones those you call conservatives [1] get thrown at them at every occasion. You know the ones I'm referring to, words like racist and homophobe and transphobe and nazi and fascist and all the other -is[t|m]s and -phobes and such.

[1] ...who in real life come from nearly all ideological standpoints, from "traditional" Marxists through classical liberals through centrists via conservatives to whatever lies opposite Marxists nowadays.