To be fair the rules of the site are that public posts are to be in English.
If you wish to use Spanish then you should take those discussions in private.
Your arguments about Spanish being more popular than English is a Moot point as it has no relevance to the rules of the site.
To follow your logic one step further we should all be speaking Mandarin. As its beats the next 3 languages combined. Your logic is flawed.
Use English plz