Semantics.

se·man·tics n. (used with a sing. or pl. verb)
1. Linguistics. The study or science of meaning in language.
2. Linguistics. The study of relationships between signs and symbols and what they represent. Also called semasiology.
3. The meaning or the interpretation of a word, sentence, or other language form: We're basically agreed; let's not quibble over semantics.

The American Heritage® Dictionary of the English Language, Fourth Edition

"Semantics" does not mean "meaningless distinction, a quibble over two words that mean the same thing." Using the phrase "just a matter of semantics" or "mere semantics" in an arguement with me is like saying, "I have a problem with winning arguements...please whip me like the dog I am. Please? Please?" You could almost get off easier by saying, "But that's women's work."