Nobody is slating him for helping out at soup kitchen you plonker.
The criticism is for using it as a cynical photo opportunity and coming across as insincere, and acting like Will from Inbetweeners.
I'd like to think that most BMooners would have the requisite empathy and awareness to shut up, listen and not grandstand or act up in such a position. He is meant to be giving out food and listening, not an ad-hoc career advisor.
Rishi has no frame of reference to that bloke. Most people haven't been homeless, but they have probably been hard up, had insecure employment or living situation. Or even just having to concentrate on what they put in the shopping basket.
Rishi has never had that, cutting back is swapping brands of champagne and caviar.