TRex, there's a
previous request of yours (from only 11 years ago, but so far unanswered) that is relevant. This was where you queried
pleb being classed as common while
plebe is rare.
According to my research, in contemporary publications,
plebe(s) is much more frequently used in the US, while
pleb(s) is much more common in most other places. I think it's appropriate to class
pleb as rare from now on, and to leave
plebe as rare.
Notwithstanding the case mentioned by Calilasseia, these terms are seemingly not often used as slurs nowadays, but more as a way of making fun of the toffs and tycoons. For example, this from the
Times (UK) in March:
Thing is, to live the life of a Succession-style billionaire, you absolutely must not meet any plebs. Airports, though, are full of plebs. That is why the rich have private jets...