The person you replied to was talking about the unfortunate situation of some communists and socialists supporting Hitler over the respective competing party. It's analogous to Bernie supporters saying they'd vote Trump over Hillary or vice versa.
They didn't support him. They basically made the statement that Hitler would mess things up badly enough for voters to turn away, and that they would get their chance then.
As it happens, they might have been close to getting it right, but they underestimated just how ruthless and exploitative Hitler would be. If it wasn't for the way the Reichstagsfire was exploited and followed up with using lies and coercion to line up the other parties save the social democrats (the communists that had not been arrested following the Reichtagsfire were prevented from taking their seats) to vote for the Enabling Act, the NSDAP would very possibly have slid back into obscurity - they never got close to a majority on their own, and their support in polls were showing signs of decline by the time the Enabling Act gave Hitler dictatorial powers.
