would you rather learn 10,000 complex chinese symbols? relatively speaking, spanish is one of the easier languages for an english speaker to learn imo. not to say its a piece of cake, but its easier than most others.
As for your reference:
Me quiero pisar a tu madre
Me quiero comer a tu madre
Me quiero culiar a tu madre
Me quiero penetrar a tu madre
Me quiero coger a tu madre
Is the same as saying "i want to fuc-k your mother"
And i know theres more, and all of them are valid phrases, not slang sh1t.
This might be the reason our friend cant understand what those mexis say, because they fuckup spanish with english/mexi words and make up a whole new language.