Mexico's Supreme Court has no right to say a thing with regards to US law, US policy or US Constitution. The article is talking (very briefly) about Mexican Constitution. One would think that was obvious, but apparently even at Hacker News, gringo's arrogance knows no limit. We do have our own laws and institutions in other countries in case you never have bothered to notice.
Second, it is a very interesting legal case which the article does no justice to (it rather gets lost reporting on the war on drugs, and the posture of conservative elements in society). There is this group of activists (SMART) that made a request to COFEPRIS - a branch of Mexican Government that is roughly equivalent to NIST - so that cannabis can be produced, stored and consumed with no profit motive. This request was obviously rejected, which is what SMART intended.
Since there was a decision of the government that affected their interests, it was possible under Mexican law to demand a "Jucio de Amparo" which can be roughly translated as a "Sanctuary Trial" and it similar to suing the government but not quite. IANAL, but the bottom line as far as I know is that you can demand the court to evaluate and interject decisions from other branches of government if you think your rights are being violated. The SMART activist group did win that trial.
What you are seeing talked about is the last appeal to that trial, which was ruled by the highest court in the country, and which the activists won again. The end result is not legalization, but undermining of the Mexican Government - and in particular law enforcement - ability to crack down on marijuana users with possession charges. If is of course open to debate whether that will benefit society at large or just some interest groups, or who those interest groups might be.
In the long term, this also creates a precedent that might or might not result in the legalization of soft drugs... but it is too early to tell at this point. At the very least the subject, which was taboo not that long ago, is being openly discussed now.
Your first two paragraphs are a seriously unfair characterization of this thread. Obviously Mexico's Supreme Court is ruling about Mexico's constitution.
The remainder of your comment is factual and fine.
And thanks for your compliments too.
What can I do, aside voting and emigration, that will make the US not "export democracy" and in general, not tamper with laws and rulemaking in other sovereign states?