My bird is a cockatiel and things are a bit different as to what they can safely consume but similar in relation to parrots. For instance NEVER give avocado to either as it can kill them in a heart beat. Does not always immediately kill but will shorten the life span at best.
While I've read MANY articles in relation to alcohol and birds ALL seem to agree that it should NEVER be done. One of the main issues is the high sugar content. Hook billed birds (and most others) do not tolerate concentrated sugar, it is, to them, a toxin. The sugar seems to disrupt the functions of internal organs such as the kidneys.
Not ALL sugars are that bad. For instance a few raisins once or twice a week is OK as it is a natural sugar where alcohol is not. Still, even with natural sugars, they should be given in extreme moderation.
As I've said before one should consider a 'pet' a responsibility rather than a privilege. I NEVER offer my cockatiel a new food without researching as to if it is safe.
If you REALLY care about your bird look at the following link on a search as to if beer is OK for a parrot. It just isn't and WILL kill the critter over time.
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Your bird and all this is up to you but, if you really love the beastie, quit feeding poison. Let's see..... Give your bird the beer but also give yourself arsenic at the same time in the same weight proportion as to body weight. I doubt that you would do that so why do you do it to your bird? I don't often get aggressive here but I have no choice here as you are literally feeding your bird poison. That is just wrong.
BTW, A parrot or cockatiel may also enjoy sharing your morning coffee. The caffeine is almost as bad as alcohol.
PLEASE, anyone willing to listen, please always research what is safe for your beastie to eat. I mean who would imagine that grapes are toxic to dogs yet they are.
As I've often said having a pet is a responsibility not a privilege. You accept such a critter in to your home which means that it is totally reliant on what you do. If you are not willing to do what the critter needs to thrive then you should have never gotten the critter. Nor should you EVER satisfy your personal 'humor' by feeding such things as alcohol.