So I was at the pharmacy to collect my prescription. The lady at the counter asked what my exemption is. I said maternity. Then she said , "I didn't want to assume in case you had a big dinner!" I knew she was joking but i sarcastically responded with' "Urgh, Thanks". I was a bit offended, no one has ever said that to me before. I know I'm big, but c'mon! It was a little insensitive of her. AITA?