My DH "complains" jokingly with his friends all the time about being married. In reality, I know that he loves being married and loves the life that we have created. Do we sometimes wish things were different, of course. Do we sometimes want a little more free time, heck yeah. A text like that honestly wouldn't bother me much.
That being said, if it's really bothering you, how about talking with your husband about marriage and what you guys could do to make it better. You don't have to bring up the text...but more of a "if you could improve a few things in our marriage, what would they be" kinda talk. My DH and I have these regularly (often on date night after a few drinks) and sometimes the answers we get from eachother are quite surprising As long as the lines of communication are open then I think you are doing just fine.