What would your response be - boss gives demeaning IM

Some background -

Currently I work on client that has consist work cycles - some are bigger than others but we have deliverables every month. Most other client groups have some months where they do not have deliverables - which causes us to have little time to do things like administrative work, revisit where we can make improvements, things like that.

I work with another peer to head up this client - I would say in the last two years we made great strides from being low on quality to exceeding quality. Recently we had a transition where part of the work was being done by a new team (all of which is located overseas), to add to that we had another team change the tax support they provided which is very technical so we had to figure out the data and re-interpret it and my peer was on leave for the month. To add to that not sure what is going on with our other support teams but for every issue we had (which was several) I had to track someone down and insist they respond to the issue or else our data would be late to the client - the responses were also in such poor condition I had to try to interpret what the h*ll they were getting at - all in all it was a horrible and stressful month for m.

Our quality went down - still acceptable but not exceeding. My peer is back and he suggested it was in large part to this new team which our boss's response was --- "All my other clients were able to catch the issues and not let them get to the client. lol"

I am simply ignoring it - especially after the insane month I had - but I am a bit upset as I worked my butt to do two people's workload and still get an acceptable quality score - by the way the client does seem satisfied and understanding - and they are a difficult client to please.

But would you respond?