Swap your job for theirs for a day then make a post!!
If that's the attitude of anyone working for an airlline then I despair! Anyone who works in a business where they interface directly with their customers has to perform in an accepted manner. If they don't like the public, find another job.
Moving on, by all means write to customer services. I've only flown FlyBe on a few occasions but have always been impressed with their product. A huge improvement on Ryan & Easy. One would hope that they would respond positively to a negative report about one of their employees.