I think that's a fair point, although I would disagree with describing
everything she does as "politics".
- putting spin on the day's news? Sure, that's politics. I expect any administration's spokesperson to do this, and I agree that Sanders did it better than anyone.
- getting angry and condescending with the press? This is a grey area IMO. Every press secretary acts with superiority and condescension; Sanders was a master of it although I think she and the Trump administration have pushed it further than any previous administration has done.
- telling outright provable lies? Okay, here is where I think a line gets crossed. Sanders has admitted under oath that she told lies -- that's certainly unprecedented.
- refusing to hold press briefings? Again, a line has been crossed. G.W. Bush (and Obama) held briefings almost daily, yet Trump/Sanders
often went weeks at a time without speaking to the press. Trump and his supporters will argue that Twitter is a far more effective method of disseminating their talking points -- which is true, but of course it's also a tacit nod to authoritarianism.
I suppose you could argue that Sanders was not directly responsible for these things and that she was merely
following the orders of her boss. But from an ethical point of view, she is still responsible for it all (especially the lying). If she had an ounce of integrity she would have resigned as soon as they stopped doing semi-daily briefings.