Spanish originated in Europe, but Spaniards in Europe are sort of marginal.
Europeans do not really care too much about Spain or Spanish.
People may go there on vacation sometimes.
Language schools teach mostly English, German, French.
Czech goalie is not language expert so he may be able to speak some English, German, or maybe even French or Russian.
Unless he goes regularly on vacations to Spain, or Latin America, his Spanish is nonexistent.
One doesn’t have to know what is being said to know he is being insulted.