DH and I are both lawyers. In the office, it's fairly common to use "apologies" or "much appreciated" as a sort of quick, not very heartfelt or sincere expression of regret and appreciation (respectfully). It's often used in email particularly. DH has a tendency to use the expressions at home, rather than "I'm sorry" or "Thank you very much"/"I really appreciate it". It slightly irritates because it sounds like he's speaking like a work email; that the sentiment is a bit less meaningful. Sort of "weasely politician" expressions.