I've never seen the white logo on a pitcher's glove as being a distraction either but the fact still remains that the NFHS says the white logo on a pitcher's glove makes the glove illegal. The following is taken directly from the rules section of the NFHS Web site.
SITUATION 3: With a runner on third, the defensive coach waits until the substitute pitcher has delivered a pitch for ball one to complain that the pitcher’s black and tan glove is illegal and wants a balk declared, thereby scoring his runner. The glove has a small amount of white thread in the manufacturer’s logo. RULING: The glove is illegal, not because it is multi-colored, but because of the white contained in the manufacturer’s logo. The pitcher must either replace the glove or darken the white threads in the logo with a dark pen that is not distracting. There is no additional penalty. (1-3-6, 6-2-1f,h Penalty)