This depends on your geographical location. Here it's a fact that spanking is abuse. Not an opinion. Thus, I can - supported by law - in my country say "abuse is wrong". In Sweden there is no distinction between spanking, hitting, or tapping - it's all against the law and considered abuse.
So if it's legal where you are it'd be valid to say "it's not abuse". Here it's illegal, thus me saying "it's abuse" is equally valid. And that's fact.
So if it's legal where you are it'd be valid to say "it's not abuse". Here it's illegal, thus me saying "it's abuse" is equally valid. And that's fact.