I agree with @StormyDay [not about sending the pictures, but the rest] .
After teaching high school (Sr. Lit) for 40+ years --retired now, I have had lots of practice with inappropriate comments and innuendo from both boys and girls -and the occasional colleague.
The comment or statement is made by the “child,” --I respond with a confused, perplexed expression and the “not sure I understand,” response of some kind, and move on or away. I HAVE had students (not usually the one making the remark) stop by and try to explain the ruffian’s meaning --“Miss, David was saying that riding horses was . . .” —but I just sigh and stop the informer with, “I understand, and I’m sorry that David can only communicate on such a level.” Then the informer and I shake our heads and move on to other conversation. Discussing one student with another was something I never did.
I suppose I may be naïve (or was then --retired now), but I thought of student/colleague inappropriate remarks as based on failure of the parent to teach the child how to communicate with adults. MANY of my students came from one parent homes --and for some I was the only adult female he/she talked with in an entire day. Perhaps the student was mimicking a remark he/she’d heard a parent make to someone and get a laugh --I saw it as my job to educate the student or adult in the proper way to speak to a teacher or other adult.
If the student/colleague persisted in making inappropriate remarks, I found time to speak with him/her privately (although never alone --stopped meeting with anyone alone early in my career --always private, but in view of someone else) --and said, “Your comments make me uncomfortable. Do you understand why?” —never ONCE did anyone say, “Gosh, no, Miss, can you explain?” --anyway --that’s what worked for me.
On RARE occasions --usually when the inappropriate student had inflicted his or her comments again OR toward another student, I called home (not possible with an adult) and asked the dad or mom or whomever the student lived with to explain why such remarks were uncomfortable in a classroom taught by an old lady. That solved the problem so well, that eventually (same school for 40 years) word got around that, “Hey, watch yourself in Mrs. Foxglove’s class --she calls parents.”