I never say 'thx' or 'soz' because I hate it when other people say it to me.
WHY?
Because if they really were thankful or sorry, they wouldn't mind adding in 2 more letters to complete the word. It doesn't even take a second. Like really? It makes me wonder if they really are thankful or sorry. And if they aren't then they shouldn't even say it. It irritates me sometimes.
Just me? Probably.