Alcohol is absolutely as psychoactive as lsd. Maybe not as potent dose wise, but it absolutely does have a massive effect on cognition, perception, and mood. Most people do not realize how massive this effect is because they are usually under the influence. It only becomes apparent when you are observing another who has consumed the substance. If it lends any weight to my statement, I study behavioral neuropharmacology.

Lsd and ethyl alcohol only have different effects, it's the dose that determines how extreme the change is.