I have two left-handed boys, both of whom love to play baseball. The 9-year-old is a true lefty who futzes around with hitting righty in the batting cages to blow off steam. The 6-year-old throws lefty, bats much more comfortably righty. The younger one's still in coach-pitch, so even though he loves to play catcher and pitcher like all the other little kids do, he's just happy to play.
The older one looooves playing catcher. When he's given a shot at it, he's quite good. He's caught some stealing, he's tagged some out at home, he knows when NOT to try to throw someone out, he keeps his eye on the field and communicates with his teammates. His fielding skills improve dramatically every fall ball season because so far, he's had coaches who've been willing to let him be catcher, and when you handle the ball as much as a pee wee catcher does, you can't help but improve.
I have been told by his coach from this past spring that once kids get up to the minors (first year in kid-pitch), no coach will use lefties for catchers because it confuses the pitchers. Lefty catchers hold their catchers' mitts in different places than righty catchers do, and coaches like consistency for their young pitchers' targets.
I can appreciate wanting consistency, but I've got a kid who's dying to be a catcher. He was so disheartened by hearing his past coach tell me the kid wouldn't be used as a catcher that he's decided he's going to practice and become the best catcher he can be, whether he gets put at that position or not. He works on his throws, he pays attention when he watches games, he... well, he just works hard, dang it. He wants to play ball in high school, and then in college, and he wants to do it behind the plate, and his parents didn't put that idea into his head.
I'm not a mom who pushes her kids to be sports overachievers. My son wants to be a catcher, so that's what I want for him. If he changed his mind and wanted to pursue something else, I'd support him, no problem.
I've just never heard this "he won't ever be used as a catcher because he's a lefty" stuff before and wanted to know what anyone else thought about it. I'm of the opinion that if a kid can play the position well, it shouldn't friggin' matter whether he's left-handed or right-handed.