Am I being unreasonable?

My boyfriend likes to drink alcohol every evening. It consists of between 2 and 4 pints. I know its not loads and he doesnt get drunk its just the taste he likes but it upsets me that he has to do it every single night!! Theres hardly ever a time he doesnt do this. Also if he has been out with the lads and drank loads and got drunk, he still drinks his two pints the follwing night. I tell him it upsets me but he said thats just him and he doesnt seem willing to comprimise on this. So every evening I have to listen to the cans opening etc!!! The more i think about it the mor eit upsets me. I love him to bits so I should just accept it??? But it bugs me he wont comprimise and realise it upsets me. Am i being unresonable. Ive no idea where to go from here because its always on my mind and i dont think talking to him again is going to helpo me in any way. Has anyone else been in this situation? Feel so crap at mo.