"Wine mom" is a specific stereotype referring to mothers who drink all the time. It's not just "oo that person has alcohol that's bad" alcohol is wayyy too normal for that. The "it's always 5 pm somewhere!" type of person. It's in the same category as the "dad who always has a beer" stereotype.
Also this comic doesn't even play on that? Like it's really just "haha middle aged people have bad humor" (oversimplifying obvs). Nothing here says "moms who have wine are bad"