He couldn’t. Referendum already happened, he wasn’t in power. He tried to sort it in Parliament first, but Greens, SNP and Liberals backed the snap election. Labour lost in the red wall, by bleeding Brexit votes to the Tories. Moving closer to remain would have gave bigger majorities in remain seats and a bigger hammering in more marginals.

In conclusion, your assertion has no basis in reality.

You hate him because he couldn’t do something impossible.