Spike Lee was so blinded by rage over George Zimmerman's shooting of Trayvon Martin ... he tweeted the address of an elderly couple, believing it was Zimmerman's ... and they claim Spike put their lives in grave danger.

David and Elaine McClain claim in a new lawsuit Lee was so filled with hate he got the wrong address and carelessly threw it up online ... just days after the shooting.

In the lawsuit ... the McClains say they received numerous death threats and hate mail ... and feared for their lives as their address was re-Tweeted countless times.

The McClains say Lee's Tweet of their address encouraged "a dangerous mob mentality."  Now they want a lot more for their troubles and grief.