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Hornswoggle saw the viral video of 9-year-old Quaden Bayles hysterically crying after incessant bullying ... and says he's been in a similar position, 'cause the wrestling star also grew up with dwarfism -- and was picked on.
TMZ Sports talked to Swoggle -- a wrestling star who spent 10 years with WWE -- offered advice to Quaden on how he should deal with kids who pick on him.
FYI -- the wrestler was born with a genetic condition that causes dwarfism
"I guess my biggest advice is don't let it get to ya.