It seems really odd to be bickering on the hardships that a homeless could be facing by talking about GST of all things. Most basic groceries and necessities have GST exempt status.
You know what taxes we have that homeless or addicts use as escapism? Smokes, alcohol. Sin taxes are much more oppressive to the poor yet are the ones who use it the most. Look at the breakdown of taxes.
https://www.smoke-free.ca/pdf_1/taxrates.pdf
Impact of GST on those at the bottom of the poverty line that may not think to file a tax return to get a GST rebate is such an odd virtue signaling grandstanding position to try to make an argument on when there are so many other things that could be done with a far better and direct benefit on their hardships. It's just so inconsequential.