I guess the thing we have to remember when travelling is that airport security is performed by human beings in different airports in different countries. As a result, the rules can be interpreted differently,
So, I am prepared with my insulin in a clear plastic bag. I am lucky that I have small pots for cosmetics, etc. and do not use prefilled pens so I can fit everything in a single bag. But this doesn't stop me falling foul of that airport's interpretation of the security rules for sharps or liquids every so often.
The rule I apply when that happens is to be polite and try not to argue. This approach has got me through 100s of flights with my diabetes kit with the odd request for a doctor's letter, separation of medication into a separate plastic bag, close inspection of metal insulin pen, suggestions that an insulin pump is fine to be x-rayed (manufacturer's do not advise this so I politely request a pat down), close investigation of my CGM and, once, being told I chose to have diabetes. I didn't argue with any of these although I reported the last one to Heathrow security management.
So, be prepared but, in most circumstances, airport security is as smooth with diabetes as it is without.