You basically just compared buying a beer to slavery. You are part of the reason I don't talk about drugs on the Internet. I'm glad you're clever enough to find a rhetoric flaw with a statement by someone who probably agrees with you but I will continue to dread an orange hubwheel today.
Sorry, no. It's actually like I compared buying a beer to civil rights. What I did was illustrate the absurdity of your argument by applying it to a well-known situation that everybody has come to agree on. I did not alter the form of your argument. Perhaps I should illustrate more clearly? I just took alcohol and marijuana and replaced them with interracial marriage and gay marriage. That's it. I did not suggest that buying a beer is bad like slavery, so we should make it illegal along with marijuana.I'm arguing that you can't compare interracial marriage being legal to anything else being illegal (e.g. gay marriage) without ignoring why it's legal and generally oversimplifying your point to the level of a grade school argument over what's fair