Part of the method used to protest bad corporate behaviour is to boycott them. The other part is to spread the word.
If you take issue with a corporation's behavior in general, then by all means, boycott them.
If the problems are with specific products, then just don't buy those products.
Many years ago, Sony did make some good electron-gun TVs. They also made a decent ruggedized boombox. You could say they made a good walkman, but Aiwa was much better. Computers? Sony made some of the leading ultraportables in the late 90s and early 00s, though arguably the Fujitsu Lifebooks were even better.
Currently the only Sony products that I own are a couple sets of their earbuds. Current model is MDR-EX71, $40 on amazon, within the OP's price range. Great sound, decent bass, flexible cord, detachable extension cord, 3 sizes of silicone buds for different ears.
The ext cord on my first set went bad, but the earbuds are still good.
The only downside, though this applies to all sealed/silicone earbuds, is that you can't hear much of the environment around you, if that matters. So they're a bad choice for, eg, biking, or jogging in a city. But they're a great choice for, eg, blocking out the engine noise on a flight.