Waribashi (割り箸） are those wooden chopsticks that you need to break apart. Some people rub them together as a matter of course, but this is only even needed if the chopsticks are so cheap that they are splintery. Doing this with good quality waribashi indicates that you think they are cheap, and therefore is an insult.
No — shaving hair doesn’t change its thickness, color or rate of growth. Shaving facial or body hair gives the hair a blunt tip. The tip might feel coarse or “stubbly” for a time as it grows out. During this phase, the hair might be more noticeable and perhaps appear darker or thicker — but it’s not.