Gabriel's goal, and an equaliser from captain Martin Odegaard, cancelled out Aleksandar Mitrovic's opener for Fulham, and kept Arsenal's 100 per cent record this campaign - the only team in England to hold that honour.
The win leaves Mikel Arteta's side top of the table ahead of the visit of Aston Villa on Wednesday night with a trip to Manchester United to follow.
The Brazilian's late winner atoned for his error which led to Mitrovic breaking the deadlock after he was caught dawdling in possession, and White was impressed with his response.
"It's outstanding," White replied when asked about the spirit at Arsenal.
"Gabi had a little hiccup and the reaction that he gave was outstanding and helped us get the win, really.
"I think the attitude and the desire we all have every day in training is showing on the pitch now.
"It's obviously always nice to get the three points. They made it tough for us and we made it tough for ourselves with the goal but the reaction from the boys was outstanding.
"With Fulham, you always have a physical game. They've got a big boy (Mitrovic) up top and he's hard to handle, but the boys did well."