There is nothing in the world more ineffective and time wasting than an online petition.
Spain’s most popular sport is ritual, protracted bull torture. I’m quite sure they’re going to pay attention to the opinions of a bunch of faceless internet names from other countries. (insert eye rolling smiley here)
This is nothing but useless, feel-good inaction. If it really bothers you all that much, write to the Spanish embassy in D.C.