The flaw in this analogy is that bigotry is actually a bad thing. That's not a taboo or a prejudice, it's a statement of fact. Bigotry is a bad thing.
But a great number of people don't really believe that, at a bone-deep level. They understand that it's shameful and embarrassing, yes. But they don't believe that it's actually wrong, in any moral sense. A lot of people don't really believe that anything is wrong, they only understand that some things will attract praise and other things will attract scorn. And such people comprise a majority of our political, economic and cultural leadership.
And that's where your problem is.
No, the problem is that you, and so many other people,
misunderstand the problem.
What is "bigotry"? My dictionary says "intolerance, prejudice".
Can someone actually live without these? I am certainly a "bigot" in a number of things: I have decided upon some beliefs and it would take
a lot, some of those life-changing events (that's kind of by definition, btw), for me to change my mind on those.
I am intolerant of a number of things.
I'm also often prejudiced because I simply do not have
the time or the means to make an informed decision when I need to make one, so I default to what seemed to work in the past for me, or to what someone I trusted told me.
Perhaps some monks somewhere could pretend to live without prejudice and intolerance. Of course they have done so on the backs of peasant serfs... Perhaps some were indeed personally saintly, and so were some hermits of the desert, but they managed it by: 1) renouncing the wider world and the social relations and entanglements (an arguably selfish decision...), and 2) having others with no such saintly behavior protect them and provide for them.
So, are intolerance and prejudice
bad things? I believe that they are as necessary, actually more necessary, as sex for every person who lives in any somewhat complex (which is to say,
populated) society. And humans being social animals, that means all of us here talking about this. Intolerance and prejudice exist because they are
tools that help us cope with a complex (and too ofter quick-changing and unforgiving)
world. How do I quickly decide whether to trust a stranger? How do I choose to approve or disapprove a behavior or action by another person that may affect me? Lacking the means to analyze the issue at leisure (we are not
gentlemen, are we? that is a luxury few can afford), we decide based on
prejudices. And having either embraced a decision copied from others (prejudiced though it may be) or analyzed the issue at leisure (if we are gentlemen with time to spare, or if the issue is important enough for us to stop and investigate), having made that decision, we then defend and try to enforce it: we become
intolerant on that issue. And there are plenty of issues on which people are intolerant, society would collapse if they were to constantly go back to questioning them.
So, having thought about these issues (hey, I do have some time to spare!) my present conclusion is that intolerance and prejudice are
an adaption to bad circumstances: the pressures of everyday life (which in part are a function of the economic systems people live under), the complexity of situations that we are forced to deal with (mostly this is the price we pay for out technology and social contracts, and that price tends to get heavier). But they are not in themselves bad things. They just can be can be badly applied.
What unfortunately happens is that bigotry gets redefined as "the beliefs of those I disagree with". They are bigots because they hold "immoral" or "irrational" (in my view of the world) beliefs. But calling people bigots changes absolutely
nothing. It may have once been a pressure tactic (shame the enemy, undermine their beliefs by convincing them they are being "bad") but by now that has lost all effectiveness. Call a person a bigot for a while, without addressing that person's actual problems, and such a person will cease to be shamed or embarrassed, and instead take the adjective bigot as a badge of honor and fight back against you. That is happening now, can't you see it?