Yes; that's my point. Is there a way of making the internet better, such that this can be handled more seamlessly, so that the people impacted by things that others find mild can just...avoid it?

Not all internet has a landing page where someone can post a "trigger warning" (for lack of a better term). Nor should it: trigger warnings don't work, and may even be harmful.

I don't think it's going to work to aggressively hide from anything moderately uncomfortable for the rest of one's browsing experience.

Now this actually sounds like a good use-case for LLM/'AI'-enhanced browsers. Everyone has different triggers and YUK! levels and it would take an insane amount of time & effort to encode all that, and setup on each different person's client side, but an 'AI-browser' with 'smart filtering' (or whatever they'd call it) would likely be quick to setup for each user's (dis-)tastes and be quite flexible in recognizing the patterns and taking the desired action (hide, warn, summarize w/o the triggers, sanitize, etc.).

Maybe it already exists(?) but I've avoided 'AI-browsers', keeping my use in their apps/sites.