NBA's Reggie Jackson -- I Got Hate Tweets ... Aimed at OTHER Reggie Jackson

It's not ALWAYS great sharing a name with a sports legend ... just ask NBA star Reggie Jackson who says he got some hate tweeted his way after the OTHER Reggie cussed people out in public last week.

Reggie -- who just signed a 5-year $80 MILLION contract with the Pistons -- was out in L.A. this week when he told us he gets confused with the MLB Hall of Famer all the time, especially on social media.

So with Reggie (MLB) making headlines for GOING OFF on some autograph seekers in Cooperstown on Friday, Reggie (NBA) told us some angry fans accidentally spit their cyber venom his way.

For the record, Reggie (MLB) eventually apologized for the rant ... saying, "A sincere apology for my profanity in public to all fans. Certainly not a way to communicate. Mad or not, no excuse."