The effects of acetic acid on porous concrete brick and mortar joints for someone who has no understanding of chemistry
Per Wikipedia on Fired Bricks, to quote their composition;

Normally, bricks contain the following ingredients:[21]
Silica (sand) – 50% to 60% by weight
Alumina (clay) – 20% to 30% by weight
Lime – 2 to 5% by weight
Iron oxide – ≤ 7% by weight
Magnesia – less than 1% by weight

I would expect slowly, with time, that the acetic acid could attack all of the above with the exception of Silica.
Flushing with water would reduce the magnitude of the attack, but I would not categorically claim that the brick structure is completely sound.