Some time ago now a musician posted some very negative things about a concert s/he was involved in. The person was primarily saying how awful the music was.
I would caution people about this.
Yes, sometimes we play music we don’t like. But to tell our audience that is unnecessary and could even be harmful. Some might love the music and think it’s the best thing ever. Others might skip buying tickets because of what they read from a performer. And, honestly, it just isn’t necessary.
I even try to be quiet about a performance as I’m walking to my car if there are things I want to complain about. (Mind you, I don’t always succeed!) I don’t want to tell an audience member about the mistakes; most of the time they haven’t a clue that something went wrong, and if they do they usually understand that that kind of thing happens. (Ah the joy of live music!)