Because my magic is part of me. You're saying that a part of me sucks and isn't natural. For other people, it's a skill they've learned and you're saying that their skills suck.
Why are you so stuck thinking all magic is the same? It isn't. My shine magic has nothing to do with witches. Shine magic is different.
Why can't you understand that different worlds have different things? Are you new to the hotel? People come here from all different worlds, times, realites. Is it so hard to accept that you're not an expert on the magic on my world? A world that you've never been to. A magic you've never encountered.