Is OTHER wrong in the post ? POST : Hello people,

So this actually happened today. This is quite important for the story, so I'm terrified of germs, everyone knows it. I avoid human contact, for example when someone greets me with a handshake and then tries to kiss my cheek I'll be like oh fuck no (and no it's not because I feel awkward, I'm just terrified of germs). I probably shouldn't say more about this 'cause you'll think that I'm even more weird so let's get into the story. 

Alright so, we sing the song to my mom and you know how it goes, you make a wish and blow into the candles. Now there was a kid who was basically screeching 'cause she wanted to do it with my mom. Also the kid was a bit sick (she was coughing and sneezing all over the cake), so when it was the time to blow the candles the kid basically spits all over it. At this point I was like alright maybe that small part isn't "contaminated" (the cake was pretty big and the kid wasn't near the part with the decorations - this will be important for later). So we had to take out the candles to cut the cake and ofcourse the kid wanted to do it, she started touching the cake with her dirty hands (The kid is around 4 years old by the way), removing the decorations and poking the cake. I asked something similar to "why would you let her do that" (because she was ruining the cake) and the parents replied it "oh she is just having fun, look how cute she is!". Even some other people told them to tell their kid to stop doing that but they didn't want to listen because their precious princess can do whatever she wants. So at this point, the cake is full of germs, filthy child touched even the part with decorations (she spent some time playing on the floor before she touched the cake, and she kept picking her nose all the time). I politely declined a piece of cake and said that I can't eat anything anymore. I ask my mom to come with me to the hallway so that I can explain the actual reason (I had to because she knew that I was lying, I love cake and I can eat it at any time no matter how full I am). My mom called me rude and etc. 

AITA here? 

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Also, sorry about the terrible grammar and etc. English is not my first language.