I'm looking at the body of work of the entire board, which is one ad hom after another.

But that's not what you said. You said, "immediately posters here attack the message/messenger rather than engage on an intellectual level." No one's doing that.

Returning to your post, of course a crowd will react differently to the substance of two different messages. That's, like, incredibly obvious. If you go to a crowd of Yankees fans and shout, "Go Yankees!," they will react differently than if you shouted "Go Red Sox!" That doesn't mean they're hypocrites. People agree with some messages and disagree with others. The crowd isn't taking contradictory or hypocritical positions on free speech - they simply hate one of the messages.

If you convey the message via burning a flag, the crowd will react differently depending on what flag you burn. A conservative crowd would react differently to you burning a Trans flag than burning an American flag. So what? That doesn't mean they're hypocritical about the mechanism of flag burning. It just means they have different opinions about different messages.

Again, I'm not sure I understand what you're trying to illustrate here about the Constitution and free speech, or liberal attitudes towards either of them. Even the most ardent free speech advocate (whether liberal or conservative) will recognize that people will still like and/or dislike the substance of different messages.