Why do people get upset with me when I hate being asked a question?

Like when I flip out, I get called out or people tell me to stop being rude and just answer the question!

One of my petite cousins asked me, “Hey so what size shoe do you wear?”
I said, “God I hate that question.”
She got annoyed and said, “OMG would you just ANSWER?! God!! You always do this every time!”
I told her 13-14 and she had a shocked looking and she was like, “Oooooo. 13 or 14?! Cousin, don’t take this offensively because it’s the truth and you know it but, you’re BIG. Seriously. You are HUGE.” She have me a look and just walked away.

Rude! I may be only 5’11” 3/4 (NOT 6ft) but I’m not THAT BIG.

One guy asked me, “I see you have autism. Do you have any friends?”
I yelled, “What’s that supposed to mean?! You think EVERY AUTISTIC PEOPLE HAS NO FRIENDS??!!”
Then he shouted back, “OMG WOULD YOU JUST ANSWER???!!!
I said, “Okay!!!!! Yes I have two best friends.”
Then he said, “That’s ALL I asked you. I asked because most autistic don’t have a lot of friends and don’t have the social skills to do so. Don’t be an ass.”
I get annoyed with stupid questions and people yell at me for being rude.
I get asked those questions so many times.