I've probably got a different definition of toxic to others if people think it's not really happened.
"Attack, attack, attack" under Karanka against West Ham felt pretty toxic at the time.
As did our own fans chanting for Guzan to get sent off against Southampton.
We're probably lucky that fans weren't allowed in the stadium against Swansea under Woodgate as that would have been incredibly toxic.
That's just off the top of my head for home matches, I'm sure there will have been more occasions.
Things never got bad enough at home under Warnock or Wilder to turn, and Pulis was doing okay for large periods of his time here in terms of results.