I had even more horrible lesson last Fri
: my quite advanced (for her level) qh didn't want to go straight, didn't want to bend, didn't want to pick a correct lead on canter, plus when I reminded her it's NOT OK to behave like that she threw a huge buck on me.
When I had lovely lesson on my much less advanced paint yesterday and was complaining about "bad lesson" day before to my trainer she said: "It's not a bad lesson. It's when you see what can go wrong at home and learn how to deal with it and correct it". And she's very right.
Don't take it such pessimistic. Even during "bad" lesson you still learn something: in particularly what you need to work on more. Horses have bad days too (as well as people). May be he was tired. May be YOU were tired and he felt it. Just take a deep breath, leave it behind and work on improving those things.