I've no interest in leaping to thr defence of FR, however "it's too noisy and it's in our rules" is the most frustratingly disgraceful comment to be made by a person who works on the ramp of a commercial airport. What's next, tow aircraft to a point beyond earshot in order for them to start engines a depart? Have stealth arrivals onto stand? Make sure that baggage, fuel and catering trucks are noise monitored when under their own power? Wear ear defenders and do the job. Otherwise work elsewhere.
I can respect an airport having environmental constraints on the use of APUs, but ensure a GPU and the air conditioning cart is available on arrival. Simply telling me 'your' APU is too noisy and we have rules for ground staff' is pathetic. It's the very same people who fail to bring you a ground cart during an entire turnaround despite it being in the handling agent's contract that they must provide one. If they were sitting inside my aluminium tube experiencing soaring or indeed plummeting temperatures, what would be their primary concern at that stage?