Yes, there is. The reason is that Grell is a male and as such, we refer to him using male pronouns, not female ones. It's just what we do in the English language so it is not a bias of yours.

I looked over the thread you linked. It truly appears that those people are insecure and only looking for a reason to be offended because of their own issues.

You are not doing something wrong and have nothing to feel guilty over.