Am I wrong for this??

previous NF I worked for had a child that was 9 and Autistic. ( they did not put in the ad that child had autism) However this child was bigger than your average 9 year old, Still smaller than me though when I first started so I felt quite comfortable taking NK out. NK grew super fast and within 2 years NK was bigger than me. I started to feel quite uncomfortable taking NK outside because if something happens I could physically not just pick up the NK and run, and NK could not run themselves. NP would constantly ask me to take NK out and I had to idea how to say I feel uncomfortable doing that because your child is bigger than me and I can’t do much in a situation where I would need to get out of fast. I purposely applied to jobs with kids 10 and under because of this. Anyone else relate??