In this link you will watch a video of Spanish nationalists in Catalonia who interrupted a minute moment of silence that was held for victims of the recent earthquake.
What's the reason these Spanish nationalists disrupted the moment of silence?
To clarify the situation, which isn't well described in your link.
The minute silence was organised by Barcelona City council and mayor, to remember the lives lost in the Morocco earthquake (Barcelona has a large Moroccan population). The protestors are from a Spanish nationalist group and opposed to Catalan independence. They are waving flags of Spain and the Civil Guard (a branch of the army that provides police services) They are protesting against the Mayor and his suggestion that the former President of Catalonia be pardoned. They are chanting "Puigdemont to prison". This protest is not directly aimed at the Moroccans. It's unclear if it was timed to coincide with the act or remembrance.
Why did they continue their protest during the minute's silence? One can only speculate. Perhaps they thought that it would bring greater attention to their protest. Perhaps it is because they knew that the Mayor would be present. Perhaps they wanted to insult immigrant Moroccans. Perhaps it was just self-centred rudeness - they just thought that their protest was more important. Perhaps it was a mixture of these. Perhaps it was the folly of the crowd. It is merely speculation. There's no reason to suppose each protestor had the same reasons.