I think its more because instead of just saying “hey that’s not cool” he publicly shat on his friend and threw him under the bus, disbanded the band, cancelled the concert.
He obviously knows Kyle pretty well, so this sentiment can’t be a surprise to him. So therefore he has no integrity by supporting his friend behind closed doors and being two faced when his sentiments are aired in public.
Part of not giving a fuck is having the integrity to be who you truly are, and from his reaction I can see is just an act.