This mom had to expect this right ? Or am I the jerk ?

Met a mom today our kids are playing at the park together. She tells me his name is Arsen. She says it out loud so I don't see spelling it anything and I must have made a face because she got mad and she was like 'dont even say it" and I was like "I didn't say anything " and she was like I saw the face you made ! People are always giving me crap about his name ! And I was like well you know what ARSON means right ? So are you at all surprised? And I honestly didn't say anything and I didn't think I made a face about it though internally I was like seriously this poor kids name is arson ? But she got all offended and left but there's no way she didn't expect that to happen or she's just stupid maybe idk

I think some of you guys are daft as well , I DID NOT PURPOSELY MAKE A FACE NOR DID I SAY ANYTHING ABOUT THE NAME. like are you reading the post ? I said maybe I made an involuntary face without realizing it she's just hyper sensitive and ready for criticism since she immediately jumped to it without me saying anything. But no I did not purposely make a face or say a word until she lost it