It is... complicated, but if a sober person takes advantage of the apparent willingness of a very intoxicated person, they have done something wrong.
In general regardless of your state of mind, you should be deciding if somebody is actually capable of giving consent in their state of mind regardless of how they act.
A drop of alcohol does not remove all ability to give consent but there is a point where it is no longer possible and so you’re left with a situation where there isn’t right and wrong absolutely but a grey area of many degrees... which as a decent person you should always err on the side of caution.
In general regardless of your state of mind, you should be deciding if somebody is actually capable of giving consent in their state of mind regardless of how they act.
A drop of alcohol does not remove all ability to give consent but there is a point where it is no longer possible and so you’re left with a situation where there isn’t right and wrong absolutely but a grey area of many degrees... which as a decent person you should always err on the side of caution.