That was unexpected… It is a typical Japanese ranking, which is commonly used by plenty of games, but I see your point. I had up to SSS at some point when developing the game, so it was less of a problem. I patched it.
You shouldn't give in to things like that and validate the delusion There will always be people saying it, no matter how tiny a portion of the population - eg it's not reflective of the majority or even a notable minority of the audience