Singapore is the only developed country without disability discrimination laws. It's already an uphill battle for the minorities to even claim some of their rights, given that they're a fringe minority and most don't have the financial nor social muscle to fight their cause. In other countries, able-bodied people take up their cause on their behalf.
And you're telling these people who're already disadvantaged at birth to be 'less aggressive' and not even ask for what's rightfully theirs? Are you willing to speak up for them? What if you had a blind sister or a deaf brother who faces discrimination and bullying on a daily basis?
Do you think RSH would even have apologized if Cassandra had given in meekly and left the store? Not even talking about campaigning for legislation here.
Start with job discriminatory laws first.