tl;dr Gate agent tried to deny me boarding because I asked whether I could keep an item with Li-Ion batteries in my bag when they gate-checked it.

Flew out of DTW to IST via ORD and LHR today on AA. Flight was full for carry-ons, so they were gate checking bags at DTW. I wasn't sure if this was AA Valet or not, so I went up to ask the GA. Instead of answering my question, he just demanded to see my seat number and then tagged the bag. I asked him where I needed to pick up the bag again, and finally he said LHR. I'm not a US citizen / LPR so I can't enter the UK, so I asked him what I should do, and he just shooed my out of the way accusing me of trying to take my carry on as a lower group.

Went to talk to another GA who clarified the bag would be checked through to IST. I was ok with checking it in that case, but I had a portable monitor that used Li-Ion batteries in the carry-on, so I was asking whether it was ok for me to check it. Midway through this, the first GA interrupted us and told the other GA that I was just trying to avoid checking my bag. I tried to explain the situation, but he kept interrupting me and telling me to give him the bag if I wanted to fly. I kept trying to explain that I wanted to figure out if it was safe for me to check the monitor.

Eventually (after no aggression or anything on my end), he told me that "I wasn't flying today." He told the gate to cancel my ticket and rebook me for tomorrow, and the other GA agent yelled at them to not do that. At this point, I just let him have the bag and the staff at the gate ended up ignoring the GA who told them to cancel my ticket (even though he said he was the supervisor?) and let me board.

I filled out the webform on the AA website about this experience (threatening to deny boarding for asking about checked bag safety is wild), and I got a copy-paste response thanking me for sharing my experiences and some stuff about being a world-class airline.

Is there a way to get an actual response from AA, or do they just not care about this kind of stuff?