Sugar may have a loose bolt, but I’d hardly believe you’d treat her the same way if you actually met her in real life. I do agree Sugar is annoying, but only because you’re provoking it by responding.
Please don’t communicate at all and leave her blocked if she bothers you so much. Sugar is just a kid and so are most of you. If you’re just going to send her hate, just block her and don’t get yourself into stuff you don’t want to involve yourself in later in your life