Anyone else??

My boyfriend and I are 18 and we've been together for 2 and a half years. We both have jobs and we've both just graduated high school, yet his mom just said something about us "laying under the covers in his bed". Does anyone think that's a little ridiculous?? We literally cuddle under blankets on the couch all the time. You can't tell me that she didn't do that stuff when she was our age. Anyone have any advice on how to help his mom realize that he's growing up??