Rude

I get to petrol station wait for about 30mins i get to the pump petrol attendant goes to assist another car which i don't have a problem with because it came 1st , im still waiting right in front of the pump another car comes in not even 5mins then this Micheal guy goes and assists i call him tell him i got here first he gives me attitude and walks away saying his already assisting and i have to wait.....i refuse to be treated this way as a paying customer his attitude sucked he did not even offer to assist with anything else as what i would think its process at petrol stations