> comes from cognitive dissonance around being forced to confront that vegans have a good point.
The problem on polarized issues is rarely "one side knows they have no good points and are just trying to avoid that the other side does". Really this mindset would be part of the preachyness problem in the first place, the idea that the only reason people don't like this side is they know this side is right so why aren't they just admitting it!
> Why confront real issues when you can make a bacon joke and say "oh, I could never give up cheese"?
I agree with this but probably in a different meaning than you meant. It's not by default "I don't want to deal with the consequences of their valid stance so I'll deflect until it goes away" it's a "I really don't want to deal with the religious guy handing out bibles when I'm just going to the café for a coffee, I'll just joke with him I couldn't live without <choice of sin here> every night instead of risking dealing with a surprise preachy interaction again". The interaction gave no hint of who actually had or knew they didn't have the right stance about religion.
> It's like when talking with someone who is very disciplined about exercise. Many will say something like "wow you're so lucky to have such good genes" to deflect from the fact that they're just not willing to put in that level of work.
In some situations like this example they probably know they aren't doing the right thing, in others (as given in the example above) that's not the case. That some topics are so is not evidence one way or another about another topic being so. The only common theme is that it was uncomfortable for the person deflecting, not the reason it was uncomfortable.