Hey, so...
…”Will you tag (something that is not a common phobia or trauma trigger)?” is always an appropriate request. Even if you’re asking “will you tag for the letter ‘e’,” you’re not crossing boundaries unless the person you’ve asking has already said, clearly, that they will not tag for a thing.
However, “no,” is an equally appropriate reply. It’s nice to have reasons (no I will not tag frogs because I post too many frogs and I forget, meaning that the tag will not protect you; no, I will not tag Disney princesses because it says “Disney princesses” in my blog description and you knew this was a dead dove before you took a bite), but they are absolutely not required.
“Will you tag for birds of prey?” “No. Please unfollow me if you require that tag.” is a perfectly polite exchange.
Setting boundaries goes both ways.
