You say that, John, as if I never interact with those people. As a member of the Classical Left and dedicated civil libertarian, who has to deal with contemporary mainstream liberals infiltrating all spaces dedicated to the Left that I belong to, and have seen their habits, common terminology, behavior, and ideology up close for years now, I think I'm in a very good position to know what those people are like and how they think.
You don't have to literally be a Baptist to understand how they think and act if you have been around them very frequently for whatever reason for many years :-)
When a liberal claims someone who deals with them all the time are wrong about what they like and how they act, what they are really complaining about is that their opponents hit a nerve by identifying them correctly.
Frankly, John, it's rather silly, for instance, to claim that liberals are not infatuated with the pronoun thing on their profiles, prone to name-calling, and seeing attacks on "marginalized" groups in everything they read that is not produced by them. In today's society, you would have had to have dwelled in a cave for the past 15 years not to know these things about them :-)