Nomar Garciaparra -- MLB Hazing's No Big Deal ... We All Did It

RELAX ... forcing MLB rookies to wear dresses is no big deal -- despite criticism that it sends a bad message to kids -- so says ex-MLB star Nomar Garciaparra.

As we previously reported, the head of a powerful LGBT group is upset that several MLB teams forced their rookies to dress like women as part of a hazing ritual ... claiming it sends the message that the idea of men who wear dresses is something to be mocked.

But Nomar doesn't think it's a big deal at all -- telling TMZ Sports, "When it's fun and good taste it's all good."