The Argentina goalkeeper upset Lille fans during Villa's shootout triumph as they reached the Europa League semifinals.
Martinez told Canal+: His behavior bothers me because it wasn't like this before.
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"I knew him very young at Arsenal, he was a very discreet guy. But now this behavior has become his profession. If you save a penalty, there is no point in teasing the opposing public by clearly saying 'shh'.
"Well, I find it wrong, especially because he doesn't need to. He did it after the decisive save against Kolo Muani, he repeated it in the penalty shootout against France, and he did it again tonight... He doesn't need to say 'shh' because people will talk about him anyway."