It's a two way street guys. I've rarely met refuellers who were anything other than helpful, but the other kind are most certainly out there. So, in return I'd ask the refuellers to understand that:
Generally the pilot does not own the aircraft and he / she is probably not the highest paid worker in the region.
All pilots have a right to days off and to spend time with family.
All pilots have a right to expect common courtesy from refuellers.
Just be appreciative, friendly and happy and you will be repaid in spades.