They all were.
That's exactly what it was because this is the Fancy Farm Picnic. McConnell gets that kind of reception every single year since 1984. So does every other speaker. One side is hyper partisan Democrat activists heckling the Republican speakers and the other side is Republican activists doing the same. And most of the time the speakers are taking jabs at the people heckling them deliberately trying to stir them up. That's what the Fancy Farm Picnic.
Articles like this are just flat out ignorance and stupidity assuming it is not dishonesty. Everything said about McConnell's popularity fading may very well be true. But being heckled entirely by far left, bussed-in Democrats at a hyperpartisan political event like has been for 40 years is not something you site as evidence for it.
I’ll put it down that you are a Mitch fanboy.