I'm a middle aged white guy, and I think what he did was at best naive, and at worst he was an idiot.
He has 650k followers on twitter, why on earth would he not just send that as a Private Message, rather than for all to see. Like all forms of offence, it's about impact, not intent and that tweet was very poor.
The last thing the club needs is providing more ammunition to the anti-City brigade.
He, Pep and Club should have immediately apologised, donated to anti-racist org and moved on.
He seems a lovely guy, and clearly a wonderful footballer, but he's been an idiot on this.