I’d rather not answer a question when someone else is tagged and supposed to answer it. Especially if that person is an old member of the forum and their questions are related to the content which only the creator can answer them. I may answer a question if I see a questioner has not received any answers from the tagged person.
I think people have different attitudes when it comes to the term “public”. When someone asks a question in public, it will become a record for future searches. Asking a question in public when another person is tagged, doesn’t necessarily mean that questioner needs the other people’s advice.
Generally, when we talk about help, we should see what kind of help that person needs, then we offer relevant answers. Any irrelevant answers are like bothering the other party.
Also there are etiquettes for tagging others in the posts on different platforms. Plus, there are etiquettes about how to help others as well as how to accept help.
But you know, people with different cultures, ages, etc. react differently, especially on the internet.