Mexico's taking a stand against the Universe ... or, at least their contestant in the Miss Universe pageant is taking a stand against the competition after an exec disrespected her.

Fátima Bosch -- Mexico's representative in the contest -- was attending a pre-pageant event in Thailand ... when executive Nawat Itsaragrisil told the group everyone needed to help promote the country in social media posts. Instagram / @fatimaboschfdz

For some reason, Itsaragrisil singled out Bosch for allegedly refusing to take part in a beach photo shoot contestants could share on their respective accounts ... bizarrely claiming Mexico's pageant director demanded Bosch not post.

Bosch called BS on the allegation ... but, Itsaragrisil reportedly doubled down before referring to Bosch as a "dummy."

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