Over the last week I could swear I've seen way more 
types suddenly throwing around the word troglodyte left right and centre
They apparently haven't heard of the euphemism treadmill. Doesn't matter what they're saying as an insult now, because through enough use, it will become the new bad thing you shouldn't say, and they will have been the ones saying it.
It's just better to not insult and to use the right word for the right moment.