Hillary lost because she was a corrupt, out of touch (Pokemon go to the polls), unlikable piece of shit who stole the primary from Bernie (as shown by the John Podesta email leaks). She also used the "pied piper" strategy to help Trump win the RNC primary because she thought he was the most beatable candidate. Voters didn't even know she wanted to fight climate change because she never talked about it. She also participated hardcore in voter shaming (which is also what you're doing) and ran a pro-corporate, right wing campaign against Trump in the general. No shit, she lost, especially in the Rust Belt, which Bernie was doing well in according to polls.

Al Gore lost because the Republican party refused to count several votes in Florida, claiming that hanging and dented chads were not valid. It was later found with a recount that Gore won that election.

When leftist voters have to choose between corporate right and corporate right, they will sit out, protest vote, or begrudgingly vote for the Democrat due to a lack of a better option. Voter shaming is extremely toxic and will actively repel leftist voters.

Voters need something to vote for, not against.