Your body doesn't need any more help building antibodies against covid than the vaccine gives it.
The biological pathways that create antibodies that are completely unrelated the ones that breakdown alcohol.
In fact there's an increasing amount of evidence that mild to moderate alcohol consumption is fine, and might even increase the immune response.
There is enough evidence to suggest that there are some compounds in polyphenolic-rich alcoholic beverages such as wine or beer that prevent suppression of the immune system or could trigger a protective effect. In other words, healthy adults who regularly consume a low to moderate amount of beer or red wine could be less prone to infections, and an anti-inflammatory effect could be one explanatory factor of the protective effects of moderate consumption on CVD.
Moderate alcohol consumption and the immune system: a review - PubMed
Increasing evidence suggests that light to moderate amounts of polyphenol-rich alcoholic beverages like wine or beer could have health benefits. Scientists have long debated the effects of alcohol on immune function, showing on the one hand, that high doses of alcohol consumption can directly...pubmed.ncbi.nlm.nih.gov
^ Notice that study has been cited over 40 times since publication.
Relax, have a beer or a glass of wine, don't go overboard.
the thinner your blood more chance if you get flu a cold you won’t be as ill maybe be the same with Covid and why maybe drinking alcoholic will give a slight benefit. Read also having an aspirin could help which also thins the blood..