Everyone who saw his dick who didn't want to see his dick. Maybe his friends were cool with it, maybe not, but other customers and staff at the bar probably weren't all on board with it.
And wider, the victims of other incidents of indecent exposure who now have the world telling them it's funny and it doesn't matter and it's "a private issue" and that to be upset or offended by it is prudish or boring.
The normalisation of flashing in public places through the acceptance of the act when committed by a popular public figure who's seen as a role model undermines the potential impact of it and emboldens others to follow in his footsteps.