if you've watched enough in the past, he constantly goes on about 'not enough spice/heat' and he's a well known curry/hot food fan.
A lot of his complaints about food are 'not enough heat/spice' and he constantly marks people down for that, while gregg has been there sweating his balls off and coughing.
It's a well known phenomenon that eating food that is seriously hot/spicy can affect how well you taste 'heat' in food, and desensitise you, meaning needing to eat increasingly hotter foods to get the same effect.
His marking people down for 'not hot enough' or inadequate seasoning based on his own preferences and spice tolerance is unfair.