Neha says bulls get angry seeing the color red, which is why a red cloth is waved in bullfighting

Why

Neha's belief makes sense given how the scene looks — a red cloth waves, the bull charges, so the color seems like the obvious trigger. Bulls, like most cattle, are actually red-colourblind — their eyes simply cannot register red as a distinct colour the way human eyes do. Scientists have tested this directly: when flags of different colours (including red) were held still, bulls showed little interest in any of them; once the SAME flags were waved and moved, bulls charged regardless of which colour it was. Test it: a bullfighter's other cape, the larger capote used earlier in the fight, is often magenta on one side and gold or blue on the other — bulls charge it with equal fury, proving colour was never the trigger. Her brother is right: it is the cloth's movement that provokes the charge — red is used mainly so bloodstains show up less, not because of any effect on the bull.