As far as I can tell, "left wing" or "leftist" mostly doesn't refer to any coherent ideology or group of people, so much as acting as a catch-all term for things the ruling class doesn't like or people who they'd prefer not to have a voice in media
Also of course if you're one of "those people" - some sort of minority or a woman or something - and don't loudly say conspicuously jingoistic shit that throws most other people that share your aberration under the bus, people will often assume you're a radical leftist. Unless of course radical leftists are the actual cause of your problems in some hypothetical argument being presented to you unprompted by someone who heard it on a podcast. The left is everyone and the left is no one