"To the extent that you did it to the least of these my brothers you did it to me."
The GB apply these words to the anointed class, saying how much the other sheep should support the anointed by preaching etc.
I used to work alongside a girl who was a Methodist and she'd been busy one weekend with her church supporting a local community cause. Anyway she was telling everyone about it on the Monday morning and she quoted the above words of Jesus, adding of course everyone who looks to the Father, Jesus has accepted as his brother. To her it wasn't about reinterpretating Jesus's words as picturing a "class", it was about taking them at face value.
Simple as that.
PS: I have always supported charities that help people and animals. I never understand JWs saying they won't give to worldly charities. I always took it to be a matter of conscience. Of course now I only give to charities doing good deeds and haven't donated anything to the WTS for several years now.