Mainly talking about the online conversation around this is hypocritical. Flip the countries around, most twitter accounts support it. Now do it in this direction and twitter accounts are all against it. Its hypocritical in my opinion.

Not speaking necessarily about the people in Mexico City, assuming they didn't immigrate to the USA themselves ever. It would be hypocritical of them though if they did immigrate to the USA at one point and are now complaining about USA citizens immigrating there.