It is common practice from narcissistic individuals to accuse vegans of being part of a brain washed society or religion. This means one has two options:
A) Defend veganism and by doing so proving in the mind of the accuser that vegans are brainwashed and will always defend veganism no matter what. Like the old tactic "you have a problem and not admitting it is part of the problem"
B) don't defend veganism and leave them the full power to initiate their smearing tactics
Smearing tactics are when someone makes assumptions to depict someone else with a bad stigma. For example, "vegans are psychopaths who let their children die because of an unhealthy diet", or "Vegans are awfully judgmental who don't respect anyone."
Another tactic used is the old witch test: you either confess and die or don't confess and die anyway. In the case of veganism it plays like this: "Vegans are malnourished and delusional because their brains lack the needed nutrients."
In this case, everything you say is invalided because apparently your vegan brain is always wrong. If you ate animal products your brain would work correctly.... But you don't.
So my question is, in a political context, how does one defend veganism from manipulation tactics?