Complaint of the rude attitude from the departure immigration counter staff

My flight is EK380 on 30th April,2023. The immigration machine could not success therefore proceed to the manual immigration counter at around 09:40. At that time, no one was quere up in front of counter so I went to the counter by using a short distance road. The immigration staff who wore white clothing told me to walk through the quere line again. I just asked him that no one was quere now why don't we go through the immigration procedure. Unluckily, I committed an offense to him so he told me to do the immigration check up at the police zone. Finally, I asked the name of immigration staff from the security zone but they didn't tell me the name or even though the counter number. Therefore I only can show my unfair situation via this platform. I'm looking forward to your management. THANK YOU.