Well, it's just a minor issue. Not something that's going to dominate British politics for the next decade.
Brexit is the biggest issue by far, it's going to cause a lot of damage to this country, so why do Corbyns supporters want to stop any debate on Brexit, they know Corbyn has other priorities.
Brexit will bring down any government who supports it, Brexit will cause a lot of bitterness when things go wrong.
May will be forced to resign and the fallout will destroy Corbyns chances of taking power as he supported this Brexit.
Any speeches on ending Austerity and poverty are just to win over the mugs, he's shown his priorities and ending poverty is not high up on his list.