Something I've noticed is that a lot of leftists seem totally unaware of how reasonable leftist positions might be wrongly perceived by non-leftists.

"Defund/abolish the police", "the Holodomor is nazi propaganda", "dictatorship of the proletariat", etc. There's a ton of these. It feels like every six months I see a Twitter thread about what exactly leftists mean when they say "stab babies with a fork unironically" and how it's actually very good and reasonable stuff and not at all what it sounds like from the scary slogan.