Is this sexualization?

So my mom posted a pic of my son in the tub with a sticker on his penis. Her sister commented "It's long........... the leg is long 😁" and when i saw it, i was like, wtf, take her comment off social media or better yet, delete the pic. Wtf would u comment such thing when it's an innocent shot of a toddler enjoying a bath??? Im so pissed and my mom thinks im overreacting and that my point of view is different. Im more upset to my aunt to be honest. She has no control of her mouth in person or on social media. The picture i sent my mom is thru messenger only and its because i just want her to see how his grandson is doing. I got off and deactivated fb right now and no plan on being there for awhile. Do you guys think im wrong or can you understand, as a mother, how i felt?

update:

My aunt texted me after my mom probably told her how i felt. My aunt called me crazy,no respect and with bad attitude&she said i can't take a joke. The message comes with tons of exclamation points by the way!!!!!!!!! Lol. I responded back and told her, she isnt welcome to our house anymore and dont ever post pictures of my son.