Definitely post-COVID. I remember going to see bands in between or just after lockdowns ended, and even the bands were taken aback by the change in audience behaviour, commenting on it. Lots of self-entitled behaviour, talking and even yelling out during quiet moments, people walking up to the stage during a seated Nick Cave concert demanding to hand him stuff or shake his hand - I remember him saying "wow, you guys really forgot how to behave over the last couple of years". Now it just seems to be normalised that crowd behaviour is worse, more self-entitled. I'm not sure what's driving it - whether people who previously weren't going to gigs decided, during lockdown, that they wanted to go out and do stuff more, but just had never learned the etiquette, and/or social media making the experience about the individual rather than the performance.