Asking Eric: This person didn’t care that they were ruining the concert for me

Dear Eric: I recently attended a concert where the audience sat for most of the concert and stood up for three or four songs.

However, the person directly in front of me stood up for the entire concert, completely blocking my view.

When I informed the person that they were ruining my experience, the person told me it was their right to stand.

I asked an usher for help, but they refused to step in.

Do you think it is appropriate for someone to be so inconsiderate? What is the correct etiquette at a concert?