Thanks for the reminder. I need to put cider vinegar on my shopping list.
Ya know, some of us are chefs, most of us are experienced cooks and all of us are experienced eaters, and we would never make a blanket statement like that. We all have our particular likes and dislikes and would never suggest that everyone should partake or not partake of any specific food item. For example, I hate cucumbers with a passion, but I would never even suggest that no one in here should eat cucumbers because they taste like watermelon rind. I also love anchovies, but would never try to convince anyone else to share my anchovy pizza.
I have used Guiness in my fish batter and saw or tasted no problems. I think you have an affliction for alcohol and/or strong flavours. When the recipe calls for cider vinegar, use white or rice vinegar. If the recipe calls for beer, use sparkling water instead.