Well there is the crowd chant which sort of kind of sounds like “Let’s go Brandon” if you have hearing problems, but insofar as I can tell they don’t also say “horse paste.”
I had to look up what the "Let's go Brandon" chant was; forgive me for being crass, English isn't my first language but it sounds like they're saying "Fuck Joe Biden". Judging by the comments in the video I saw, I think that is what they're actually saying rather than encouraging the young man being spoken to by the person with the microphone.
Yes, people said the reporter was "misreporting" the chant but she was barely containing her laughter and it was clearly a joke. Everyone knew what the crowd was chanting.
You heard correctly. A reporter said it was "Lets go Brandon" in stark contrast to obvious reality, and the originally Ironic and now more widespread adoption of that has confused the situation further.
The actual Brandon thought it was funny, as the chant probably aligned with his personal feelings.
In case anyone else doesn't get the joke, the reporter (as most reporters do) was covering for Biden when she pretended his noisy opposition was something else [1]. In other words, it was an unusually obvious attempt at a tawdry cover-up. Thus, the mockery in calling Biden "Brandon".
If the reporter lacks credibility with the audience they should be fired
If a performer, a wrestler, a musician, an actor loses credibility with there audience, you should get a replacement.