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Elizabeth Hurley 's son says rumors about Billy Ray Cyrus are achy-breakin' his heart ... insisting the country star's a great guy no matter what anyone says about him.

Damian Hurley posted about her mom's new squeeze on Instagram Friday ... starting the post acknowledging he's been in the public eye since the day he was born -- and he tries not to comment on all the BS he reads about his family. Instagram / @damianhurley1

However, Damian writes he's breaking the rule because he can't stand by while everyone slanders BRC ... "one of the sweetest men" Damian's ever met, he adds.

Hurley goes on to state he loves seeing his mom so happy ... and, he claims Billy and his children all get along super well despite reports to the contrary. Getty

He finishes off hi

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