I think bottom line is making that face is meant to demean and degarde. Whether it was for Symonds or anybody else- that is personal and not a defendable viewer behaviour. Next thing we end up defending is abuses in Hindi or other regional language.
If weant to encourage and bring in more competitve cricket in the country, fans have to be responsible too and not be hostile.
Finally it is a game and friendly competition and teasing is fine. But making monkey faces is personal and degrading.