US military drones are hackable and have been brought down.
Having said that, then no, no drones is infallible. All of them can be hacked by those who know how to do it.
What are the chances of you encountering an evil doer. Very very small.
But there is always the possibility of some idiot out there who loves to interfere with network communications and send disconnect requests Or hack things for the heck of it.
Bebops (1 and 2 ) can be made a bit more secure by enabling passwords.
Bebop 2 is easy and that can easily be done By the average consumer that is. Bebop1 require a minor access to the OS configuration.
There is a way to setup and enable host authetication, host secure keys, even cryptography, etc. But that is beyond the scope of this topic and would require OS security and networking knowledge.