Does Editorialising or having a political slant make news less factual?

Hi everybody. I'm an aspiring journalist, and I've been trying my best to keep up to date with the news, in a way I haven't in the past. I like to read a lot of news, and I try to read from reputable sources which are considered generally neutral or non-partisan.

The other day I was reading a group chat where one person sent an article from Apple News, and someone else simply rebutted that by commenting that "Apple News is leftist." Now, I think that's quite harsh, and certainly isn't a valid rebuke of the article's claims even if true. But this is a common rhetoric that's used to dispute the news all the time, that X publication is left/right leaning and can't be trusted.

As journalists, what do you think? Are publications with bias okay, or not worth reading outright, or something else entirely? If someone tries to ignore reporting based on the bias of an outlet, how can I counter that point?

Thanks everybody