Offensive words

Words I find offensive? I never know until someone says one and I have the urge to beat their face in. The word is usually accompanied by laughter, which raises the annoyance levels to seething violent hatred. Which is weird as fuck because words are just a collection of sounds. The same utterance of sounds don't event have the same meaning, depending on the language. So why should one noise be okay while another make us hiss with hackles raised? Who knows humans are weird.