Fail
Nearside front direction indicator incorrect colour (1.5.1b)
Fail
Offside front direction indicator incorrect colour (1.5.1b)
Fail
Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking rear lower engine to frame bolt insecure (6.1.1c)
Fail
Drive chain sprocket carrier worn to excess rear sprocket not inline or secure 1 nut is missing (6.2.1e)
You were brake-checked because you have an attitude problem, one that causes risk. Even if other people make mistakes that is not an excuse to make the situation much worse, which in my opinion is what you did here. The driver will most likely remember you not as someone aggrieved over their positioning, but someone out for trouble full stop.
Nearly killed my grandkids on 10.9.19