I think it's important to seperate BernieBRO from BernieBOT.
I think the two have been mixed together, but in the beginning, the BernieBRO tag was meant for someone that was a rabid Bernie supporter, BUT was an obvious privileged white male, that would make terrible sexist, mysogonistic, possibly racist remarks.
To me this is not to be confused with the BernieBots, that are rabid supporters, that seem to have gotten a thorough brainwashing into the Sanders cult-like following, could be male or female, that would launch into straight anti-hillary tirades, stating that she is worst human to ever be birthed on the planet and that everything she's ever done from the time she could talk is suppress, warmonger, hate, take piles of cash just to screw the little guy, the antithesis of all that it good in this world.
You could come back with reasoned debate, list off a dozen instances that Bernie made bad decisions that stack right up there with Clintons, but it would then be met with calls that you are a tool of the oligarchs, being bent over by your corporate overlords and that somehow every primary that Bernie won was perfect, and every one that Hillary won was rigged, cheated and bought by the establishment.
There is crossover, but to me there is a distinction between the two terms.